The item being referred to is usually called the CVV (Crankcase Ventilation Valve), and it`s located in an inconvenient spot that makes it a major pain in the balls (in most people`s opinion) to change. If your guy is willing to do the job for only $280 bucks, hand him a check, and give him a big fat kiss, as he`s doing you a favor....
(just make sure that replacing *all four* hoses that go with the CVV is part of the deal)
The road goes ever onward....
*Please support the Wounded Warrior Project*