Land Rover Repair: RRC 1993 LWB windows do not work, ecu repair, fuse box

Question
This happened before and I replaced the ECU with a used one.

When that failed I sent my original and the spare to a ECU repair shop. They said there was bad soldering on both boards.

I put in each board without success in getting any switch to work

All fuses in the main fuse box are good and I replaced the 15amp fuse by the passenger seat

I have replaced two of the yellow relays in the glove box

Still no action

Please let me know if there is a electrical check I need to do

Also I have fault code 20 on my display but don't see it referenced anywhere.

Thanks,
Jim

Answer
Get the electrical troubleshooting manual for your truck, and jump the wires on the window ECU connector to power the window switches all the time.  That is the simplest repair.  You could make something up with a relay if you wanted the windows deactivated when the key was off but most drivers dont care.  The ECU parts are getting unavailable