What does that mean? Does it mean a safety recall? If someone comes in with an AIR1 under warranty are you supposed to replace it with a current 2nd stage? If not, are you supposed simply say "your SP reg is not safe to service, have a nice day..."
If there's no recall, I suspect the whole thing is BS.
BTW, there's no part on the AIR1 called "plate" so i'm not sure what you are referring to. There is a part called the "switch back plate" I can't imagine how that would 'break away' from the case (it's on the inside) but if that dive/pre dive switch assembly is suspect, then it also means that the assembly on the pilot and all D series regs would be suspect. Do you think that's the situation?
The plate is part of the case assembly as mentioned before, not the switch. It isn't a part per se, it is the flat part of the case that the guard fits into. As I stated earlier, at the SP clinic it was stated not to service the reg. Part of the reason for this is newer technicians are not taught how to service it. There are some technicians who learned to service it, but there are not many out there who can. SP also stated the plate may break free due to age. This does not mean recall. The Air1 is old, it was made between 1974-1986. Things simply wear out over time. I have yet to read any statement from a manufacturer that states all regulators made will last forever. You can take this information however you want to. That is up to you. There are some regs that are old and hold up quite well. The first stage in the OP is a good example. The Air1 isn't a good example; in this case there are better options.
This does not apply to the D-series second stages.