So my 540 just started leaking oil while riding around in the vehicle. While running the saw the oil is being pumped to the bar but it is also slowly leaking out the sides and bottom of the saw. I cleaned everything then realized that the Oil flow screw doesn't turn smoothly... feels kind of stripped as it doesn't turn smoothly and "skips" popping up and down. My question is, is this as straight forward as it seems? If I take it to my guy can he just put a new oil flow screw in it... is this something I could do? (novice but adventurous) Or is this symptomatic of a bigger problem... Any thoughts appreciated, Cheers!