I hope you get everything worked out and can survive for 10 months. We're 2nd floor dwellers ourselves (thank goodness, only for one more month...then we're moving to a house). We try to be considerate of those below us - we only have one person below us. He tends to do his laundry from midnight to 3am, but he leaves for work between 3:30 and 4am. I work out at home usually around 5am, but he's long gone. We've never had a problem with him complaining or us complaining, but we do try to be respectful and not make a lot of noise when he's at home. And I definitely know that cats can be loud - ours love to run around every once in a while and they do sound like elephants. Perhaps you can do as someone above mentioned and make note that her dog barks, but you understand they bark. Cats jump from place to place. Good luck!

Do you have a warranty? We bought ours at Sears and had free maintaince on it for two years.Perhaps you could try contacting the company that manufactor and see if it is known for this problem? I'm not very mechanical,so sorry I dont have better advice.

A book with beautiful photographs that might help you to get off the "decorating treadmill" is No Compromise Decorating by Lynette Jennings (2004). It is an insightful look into the decorating mistake many of us make: compromising what we really want for a trend or a quick fix. Here is an excerpt: "Always celebrate the connection of your home to your life; don't apologize for it, and don't compromise. Home isn't a look, it's a feeling. A place where memories are made and legacies are formed. That said, why would we for one second hesitate to make choices based on anything but what our heart desires? Why would we even for an inkling be distracted by a new product display, a neighbor's comment, or a 'dream home' featured on TV or in a magazine other than for the inspiration it provides? Call it conviction, stubbornness, determination. To eliminate the pressure. The fear of decision. To dig for the courage to live how and with what makes us happy. That's decorating without compromise." Life is too short to compromise. Surround yourself with colors and objects that bring YOU joy.

As Brickeye said it could RF induced. To check plug a resistive load, such as a lamp, into the receptacle to see if you still have the problem. If so, then it sounds like a different issue. I guess it is possible there may be a nail going through the say the neutral & one of the twisted wire pairs(keep in mind it might just slightly be nicked & when the treadmill runs the vibration makes the two make connections). Check the voltages on the phone wires while the treadmill is running. You may want to do another test as well. Plug a hair dryer into the receptacle & see if you have the same problem. This is an inductive load as well & will generate RF noise but without the vibration. This is a long shot but easy to check. Also, plug the treadmill into another receptacle on the same circuit to see if the problem continues. And then plug it into a receptacle on a different circuit. And to continue this debug process plug the DSL modem into a different phone line jack & test it, then a different receptacle but same phone line jack & test it, then a different phone line jack & receptacle & test it. This will help determine if the problem is "unclean" power going to the modem or if the phone line is having noise coupled onto it. Are you using the same duplex receptacle to power the treadmill & DSL modem? Are they on the same circuit even if not on the same duplex receptacle? How close is the receptacle to the phone jack?