I haven't had that problem but I have had the bed apart and you will need to
disassemble yours some too before you can get at the mechanism .
I believe you can get to the motor and mechanism by just removing the cover
panel located under the mattress at the head .
There is a coupling to the motor that is most likely the problem
If you look in Quick Tips and Mods on page 77 the down starting with post 1072
you will see some pictures of the bed construction . The motor is barely visable.
You wont need to disassemble to the extent shown there .
Ok here is an even better thread showing exactly what I think you have .
http://www.irv2.com/forums/f115/brok...ng-439888.html