As for WHY it is 'running briefly on start up' could be a number of reasons, but having had my first and only RR for about three years, from my limited experience with these machines, I would be more worried that I could actually HEAR it running, made me think, went out to 2006, dropped and raised it several times and from in the car, I cannot hear the compressor.
Apology! Edit to above - Meaning, that if you can now ACTUALLY HEAR the compressor, it sounds like it's due an over haul / filter cleaning etc? I have only ever heard mine when the boot floor was lifted up and spare wheel out for cleaning.
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