So it looks like the LG is finally fixed. LG tech already replaced the board, inlet valve, and pressure switch with brand new parts. None worked so the tech pulled them out and reinstalled the original parts. He then replaced both pumps and we ran a test load. Looks like that fixed it. I was about to give up and just use it as a washer/spinner but it's good to have it back at 100% as a backup dryer.

OEM parts were surprisingly cheaper than those available online. Labor is understandably high but I still paid less than what I already spent trying to fix it myself.

Kudos to LG PH for not giving up. Tech was happy to close 8 tickets including mine yesterday. Problem is he still has 41 left