Your indy shops equipment could not find a fault in the system because it is not capable of accessing the system. You need a VST to do that with (Volvo Scan Tool). The panel lights do not flash like that for fun, they do so because it has logged a fault code in your system. You might have bumped something loose but it is not likely. If I had to guess I would say a faulty blower fan and/or power stage but without pulling the codes you can't say for sure. Did you local Indy charge you for not diagnosing your a/c problem?
Mark
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