What exactly is the problem that's happening?

Fault 39 refers to the water level sensor. The pressure tube runs from an air dome at bottom/side of the tub up to the pressure sensor on the control board. A small hole in the tub wall is open to the air dome. Air pressure trapped in the tube increases as water rises in the tub for sensing the level. Check if the tube is perhaps pinched or kinked (it runs into the console with the wiring harness at the right/rear corner of the cabinet). Examine the full path of it from the air dome to the control board. You may notice what appears to be a wire inside it ... there's no electrical connection involved, I believe the wire is to help prevent kinking toward the board end. Less common, the tub opening to the air dome may be clogged with debris (requires pulling the inner basket for access). There's also a seal at bottom of the air dome, held on with a clip, which can be removed to clean in there. If everything physically checks-out on the air dome and pressure tube, then the pressure sensor on the control board may be bad, in which case the board must be replaced. The pressure sensor is part-and-parcel of the board.

Could be a bad/stuck out-of-balance switch. Check that in Diagnostic Mode. If the lid is supposed to be locked but isn't, then the lid switch may be bad.

@HU-800120566 Next step is do not try running the machine any further with a bad pump unless you have confirmed there's a fuse on the pump wires in the console, and even then it's not a good idea. The next step beyond that is disconnect the wires from the pump and 1) check for 7 ohms resistance reading on the pump and 2) check for 120v power at the pump wires when running it in diagnostics. If no power at the wires then the motor board is bad. If the resistance reading is more than 10% wrong either + or - then the pump is bad ... but it could be bad even if the reading isn't too far wrong. A test cord can be rigged to run the pump directly from an outlet. Clearly the pump is bad it it doesn't run that way ... or if it runs but overheats and shuts off. Are you sure you're getting Fault 39? A failed pump typically triggers Fault 37. However, the machine does not monitor pump operation directly. Failure to drain is determined by way of the water level not dropping when it should be doing so ... which is via the water level sensor ... so Fault 39 could also be part of that problem. 36, 37, 38, and 39 can be related to the water level sensor or pressure tube issues.