Sorry if I seemed harsh, but having managed electronic repair facilities at times in the past, this is exactly the sort of customer-induced problem that is way too common. It is not usually apparent to the customer why their action has caused their problem, and diagnosing using documentation from the manufacturer causes frustrating false leads. It is astounding how often a can of WD-40 turns out to be the weapon of choice for ANY problem folks encounter.

Please understand your service manager was being nice to you - the problem was not his fault, nor the lengthy diagnosis. Someone, though will have to pay for the techs' time spent on your problem, as in higher service rates.

Steve