I am thinking the same thing... but...
1. The compressor pumps up to 1750KPa (abt 250 psi), and then sloooowly (over 5 mins) press bleeds down to about 15 psi , WHERE IT STAYS.. for next 20hrs when tested. And the compressor doesn't kick back on. So.. it does act like a simple leak, except it doesnt go down to 0, and the suspension height is the same at 250psi and 15psi.. which make little sense.
2. So this points to a faulty tank sensor.. but.. I thought the compressor cycling is controlled by the internal pressure sensor.. maybe not.
3. Often, I get 'red' suspension fault, every time I accelerate above, say .2 G.. But handling feels the same, not too squishy ..
So overall I agree, (maybe just being hopeful), that it's still somehow eitehr a sensor or a physical leak, but it doesnt all fit.. the press. bleeding so low, etc.
PS. again. I have a new Hitachi style compressor fitted.