raymond easi reach tilt/ss button disc: 828-006-148
do as swoop said to enter password. use tilt up/dn to scroll throuh menus, scroll to learn, press horn to enter learn sub-menu, select controls then press horn then follow directions on display, when done exit sub menus and quit and save. it's that easi!

Talked to customer. The password is factory. Where would I need to go next?

well normally you could hold the horn and right or left sideshift button on the handle while turning the truck on to gain access to the passcode menu, then the default password for raymonds were Ray1 and Ray2 but chances are they have been changed. Raymond is notorious for doing this so unless you know the access password you will not gain access to do the relearn without their assistance.

You can try to just put the handle on and hope it is close enough to work but that's a long shot that it will work.

After possible replacement or repair, how do you get in to relearn it?

they should offer individual parts although they tend to want to try and sell a complete handle most of the time.
if you are forced to buy a complete handle from raymond insist on a reman handle.
Usually trying to repair handles is more time consuming than just swapping one out, that is why they push the whole handle most of the time.