These are not old transmitters, being produced today
That vintage. There were some internal parts changes. What you see outside isn't always the same inside between different production batches.
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These are not old transmitters, being produced today
So, it would appear that BM prefixed transmitters will be serviced as long as failure is not due to flooding outside the warranty period.
I'm betting there have been quite a few changes over the years. While it looks the same on the outside, I would bet the internals are quite different. Not sure exactly when the PPS transmitters were introduced, but I bought my first one back in 2013. 11 years is eons in the world of electronics.These are not old transmitters, being produced today