People may wish to know the outcome of the mechanic's work. Don (the mechanic) arrived at 9 this morning, and he and Lee worked until 5:30 this evening, Mountain Time (7:30 Eastern Time).
We took a test run, and two slides didn't quite work, but Don knew exactly what the problem was - one of the wires had not been grounded properly. Fortunately, he was right, and the second test run worked perfectly. Don will return in the morning to put the system through more stringent testing, just to make sure, but so far, so good.
What is quite amazing is that, in a past life, Don was a hydraulics expert. What good fortune for us! We are all going out to dinner tonight, for work well done.