Good News! The Robbe's Precision Grease arrived today. I am actually quite surprised at how fast it got here from England. I wasn't expecting it for some time yet.
So, I finished putting the switches together. That went well, except for having to re-do the assembly on two switches because I assembled them backwards. (Not on board, but the switches themselves.) Good learning for next time!
Since I had the time, I decided to finish the re-assembly of the amp. Re-soldered the switches back in place, and checked the tiny solders on the back with a jewelers loupe. That all went well, too. Put all the boards back in place, and locked them all down with the brackets provided. I double checked and triple-checked that I did not miss anything.
Then, I fired it up using the dim bulb tester. More good news. The bulb went dim, and the new relay switched on in about 2-3 seconds. Excellent. If you remember, the original relay was taking 20-25 seconds to click on. Nothing sparking, nothing smoking, so I went to the next step.
I then plugged it in without the dim bulb tester, and then let it warm up a few minutes. Now to adjust it.
First, I set the constant voltage to 48 volts. With the new trimmers (love them!), I got it to +47.97 volts, and -48.10 volts. If you remember, when I did the original measurements before servicing, it came in at +31.5 volts and -31.25 volts. This is much better.
Then, I set the DC offset to exactly zero on both channels. Excellent. Before they were set to 26mV for left and 79mV for right. I was surprised that I got to exactly zero on both, but I will take it.
Finally, I set the idling current for the power transistors to 15mV for left and 16mV for right. Before service they were 10mV and 9mV respectively.
The final step was to put the amp back in place and try it out. Oh my gosh, what a fantastic sound! I notice that the highs are clearer, but the bass is still as strong as it always was. Very clean, very clear sound, with excellent sound stage. I am very happy. I will keep a close eye (and ear) on it for the first little while, and let you know if I find anything wonky, but so far so good.
Thanks everyone, especially Jeromach, for all the help and encouragement! Now, wine and music...