So I just bought an original Fender Blues Deville 4x10. I paid $300 knowing it had a few little quirks. not my main amp so I didn't really think too much about it. took it to a guy with brand new tubes in hand and explained I thought it had a bad relay. $25 part.. He tells me today the amp is done and I'll love it. $175 bill! am I getting screwed or is that about the going rate to replace a relay?