Im not a repairman, so all my knowledge to fix my washer came from either youtube or online chats. I posted this to help the next dad trying to save a few bucks.
Door sensor...
Since door sensor worked correctly, verified that by starting washer with door open, and agitate cycle would not start until door was closed. Meaning door sensor worked correctly.
Timer...
In high spin cycle washer sounded correcltly spinning, but when opening door, drum was was not moving. So timer was triggering motor to start high spin, but drum would not move. Also tried rotating drum to catch clutch, and closing door, that worked sometimes
This meant timer was OK, and clutch was starting to fail and catch drum.
Clutch and coupling
Decided to change clutch and while i had the washer disassembled, i also changed the Coupling.
I followed videos to change clutch and coupling, removing washer cover, job wasnt too bad, took about 2 hrs, hardest part was to put cover back on. The old coupling was original plastic and had minor wear, but not significant. Old cluctch ring easily turned w fingers, and had slitghtly come off clutch metal case housing dish. After fixes, Washer goes onto high speed cycle fine now, i think that because i chaned the coupling to the metal reinforced ones, the washer is quiet and smooth like when it was new.
Good luck on your project