Since you aren't the original owner, you're SOL for warranty work......but, if I were you, I'd talk to Marlin and get their feedback on the problem.
My 1895GS rifle had problems when I first got it.....Sent it back to Marlin and the barrel was replaced, so they do do the work you're contemplating. It's probably going to cost you, though.
Let us know how this turns out. It has been my experience that Marlin is very good at making satisfied customers out of those who return rifles for service work.
It just occured to me that if the previous owner didn't register the rifle with Marlin, YOU could be considered the original owner......if the warranty card came with the rifle when you bought it. Check into that.
hog