I appreciate the input from everyone's combined experience on here!
I just talked to the mechanic who is having second thoughts about his head gasket suggestion. In 20 years, he has only replaced one, and it was from a Boxster that dumped all its coolant and the owner drove it hot. He wants to pressure test everything and see what he comes up with. I suggested a faulty new tank and he paused and sighed. Then said its a definite possibility, but he didn't want to think about it because of the enormous pain they are to replace.
So you guys are on the right track. More likely a tank or cap than a head gasket issue.
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