Are these used compressors or new? If new I hope the person doing the work is making sure it has the right amount and correct oil. I Used you sadly can't say how long a used unit has been sitting around.
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When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.
Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).