How many service calls have you had? The guy should have been able to spot the problem. Normally they have the tools and experience to know what the source is likely to be. I would call the company he works for and try to get someone who knows the system. Your in an age of unit when things start to go wrong. For a while, it will still be cheaper to fix than buy new, but you have to have a solid repair man or the service calls will eat you alive.
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