Sooooooooo (that's like "so" but with three syllables,) here's what happened. Apparently there was more than one failure in procedure. First, there was a seal that was completely left out of the unit. That was chalked up to training. The second problem is that they didn't catch the problem in testing. They explained why they didn't catch it, and it has something to do with the unit being an octo/inflator, although it's not a good reason or even a good excuse. Apparently, after service, they checked the reg part of the unit, but they didn't actually try to inflate a BC with it or hold the unit under water with pressure on the exhaust side from an actual BC or whatever. They even went so far as to say that a lot of customers bring in just the octos with no BC attached, making it hard for them to check. Of course this was not a satisfactory answer to me. I asked why they had a hard time checking mine when the regs, octo/inflator and BC were all brought in together. The bottom line is, I believe they had a new(ish) person doing the work without proper supervision and double checking. I don't know how they certify their techs, and I decided I didn't care enough to ask. I, of course, do find this inattention to detail and my safety to be totally unacceptable. I did get my unit back, I will still be swimming around a chilly pool again tonight, and I'm sure I will have a great time in Hawaii. I do need to think about who will be doing my servicing from now on.
p.s. The lead tech thanked me for not making a big stink about this. I replied that making a big stink to him wouldn't do any good, but that he shouldn't interpret my lack of yelling as a lack of concern or anger. Actually, the more I think about it, the more I feel the need to make a big stink to the proper person at the LDS. I understand that stuff happens. If it was a nicked seal that caused trouble later and was difficult to detect, that would have been one thing. But a misssing component that could have easily been detected with just a simple pressure check is really unacceptable. At least it was obvious to a non-expert like me, saving lots of hassle and problems later.
Mike