I did the upgrade on my '99 Series 32 Kwikee steps. Buy the upgrade kit, consisting of a new electronic controller, motor, gearbox, door switch, wiring, and lever arm. (extra cost if you need it) I removed the stair assembly, sand blasted it, and then had it powder coated. I used new grade 8 attaching bolts (4 total) on the main frame. Install everything per the included instructions. Lube it up and you should be good to go. You can install everything without removing the stairs or powder coating, if you prefer.
The stairs are heavy and the actuating arms can pinch fingers/arms if you electrify them too soon, so, . . . . be cautious of that.
Chum lee