Do you see the pic?
You were speaking of the derby cover gasket
No reason why it should have rub marks unless you have a fastener backing out of the clutch hub but it would be a circular pattern all the way around.
Looks like screwdriver holes to me,,??
I never cared for the full gasket,,, IF mine, I'd go back to a "O" ring style.. If unavailable, stay with the fiber gasket.. If anything Hit from the inside, there would be a bigger problem than just the gasket...
Close looking???? could the gasket been bad(holes there) and a sealant covering the gasket Melted off into the oil after heated enough????
Don't see any other way..
OH Yes, Did you install the gasket OR did the shop???
signed....BUBBIE
The shop installed this.
There is your problem.