The canned air thing hadn't occurred to me. They make a spray for electronics diagnosis that gets even colder. Finding a part with intermittent failures can make you nuts. Freezing a part will usually make the fault show itself. The good stuff can get you down to -60F.
It's common stuff, Radio Shack stores used to carry it. But don't know if they even sell parts now, haven't been in one for a long, long time.
