Is it "normal" to have a "vacuum vent valve leak" at 80K miles? on 2007 Subaru Forester

Cost will be 720 (work) + 115 (part) after having a HEAD GASKET REPAIR AT 75K MILES!?

Asked by for the 2007 Subaru Forester
vac vent vales can go bad at any time. get a 2nd diag and est