Found the solution for my GTW460 which was stuck in drain mode. GE repairman ran diagnostics. He explained that the washing cycle had been placed on pause. It had not been restarted so 12 hours later it automatically went into 'over-ride pump mode'. That why the pump was running in the middle of the night and wouldn't shut off.
He explained that in 'over-ride mode' the pump drains for 10 min. During this time, none of the buttons or lights work. Only the pump works. After 10 min. the washer resets and works as it normally would.
Too bad this info isn't in the troubleshooting guide!!!!!!
There is a vague reference but the wording isn't specific enough for an owner to figure it out. Even the repairman read the wording and agreed an owner would have not be able to troubleshoot with their guide. Hope this helps.