It's not the case.
The motor was replaced by PMNA just 7,000 miles ago and if there was a blown head gasket it would be eating coolant prior to failure. This last time it went over 1,000 miles and a few weeks without losing a drop of coolant.
If there was a blown head gasket there would have been coolant consumption that would have warned us. The oil would also show foaming and a caramel like coloration which is not the case.
Although the cap is a highly ranked suspect at this point. I replaced the cap the first time, but I'm starting to suspect it's the cap allowing the system to over pressurize.
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