Head gasket Gpz 500S defective?

Hello together. I’m desperate! I drive a GPZ 500S, Built: 93 and only real 25800km ran!! (Just walked in?!) But for a short time now a little oil comes out below the exhaust manifold (during the ride). Is really not much, but looks like shit! Besides that pulls on the side cooling ribs. Am I right with my guess, that the head seal is flat? Even after so little mileage? I was already with the screwdriver, but he meant that it is not worth it m because the valves have to be renewed when the head gasket is renewed!! But he also said, if it is not much, I should live with it. Besides, he offered me to pull my head after it (50€). Only the head gasket would be renewed, I would still be confident to make myself, but if I still have to go to the valves, the fun stops for me (also pricey). What do you mean? Must be ground? Do valves have to be redrawn? r Make poetry new (repbook available), or make it friendly? (prices?)? Or just live with it? (no that I don’t want to). She was always fart-rocking until now! Please help me!! I am grateful for every suggestion!!! Left hand to say hello… Phil