Picked up the truck this evening and they restored the courtesy lighting. Sounds like they had quite a time ... first, the tech found a "B2618" code, then started diagnosing the "trouble tree" looking for short to ground on supply side of courtesy lamp relay, circuit 690 (grey/black wire). No short to ground. Tech checked connections a BCM. All good. Replaced BCM and programmed; courtesy lights still inop. More techs retracing "trouble tree". BCM not switching. Finally called Tech Assistance ... informed of new software yet to be released on this concern. Case #698023.
VCI(?) software sent to correct condition. Reprogrammed with updated software ... all lamps operational !
Now everyone can check the bottoms of their shoes at night even ...
Steve, I faxed your suggestions to the dealer late last evening ... think they were on the right track, but thanks again.
...Kris