When my aos failed it was VERY difficult to pull the cap off. It was far more vacuum than normal. I pulled the cap off the other day and experienced similar results to you, but I could actually get the cap off. When mine had failed, it was blowing huge amounts of smoke on every start up and I had a squealing noise from the motor. I think your good.
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2005 987 - 112K miles PASM + 6-speed - Daily Driver
1988 944 - 240K miles- Race Car
1974 911 Targa - new project
2009 Triumph Street Triple R - 27K mi - Blazen Orange
1976 Ford F250 camper special - tow vehicle
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