HP 41c STAT 1 module version 1A

[dmh]

I have a STAT 1 module that is version 1A but can't find any reference to such a version being released.

- Serial number starts with 19
- Catalog has one more function than my 1B module (*c)
- Catalog works and a few functions I tested appear to run but some hang at some point
- Service Module says module is bad but does it look for released versions or does it actually check something (eg checksum)?

Anyone know anything about this version and can advise?

Thanks, dmh