Update on the slides. The left side worked, the right side doesn/t. Swapped controller boards. The problem remained on the right side. While troubleshooting, we discovered that by grounding one of the two center pins, the slides will move in or out. This isolates the problem to either a ground or other writing harness trouble.
Overriding the control board also bypasses the control board safety features. Spoke with the service manager and facility owner, through mutual consent, the bypass will be used once to open the coach. The engine problem fixed. Then the slide is closed and safety latched. And then the coach goes to another place to troubleshoot/repair the slide issue.
I'm guessing I'm done for the season. Had one more adventure scheduled. And the coach goes into winter storage by late October.
On the financial side, I do have a never used Good Sams Service Plan. Fingers crossed, credit card reserves are adequate.
Stayiing tuned.