Sounds very much like what happened to mine. I didn't check for damage but took it directly back to the dealer. My dealer is only eight miles away. Had he been 60 miles away, I would have checked for scoring and done a compression test like others have suggested here.
It turned out that the saw needed a piston and jug replacement. The dealer first told me that the regional Dolmar distributor might not honor the warranty because the damage resulted from using E10 in the mix and the owners manual warns against using fuel with alcohol in it. The new version of the manual on the Dolmar website contains no such warning however, so I showed him a printout of that.
A week later, the dealer had repaired the saw, but was waiting for the regional distributor to authorize the repair under warranty. When that still hadn't happened a week later, I told him that I would publicize Dolmar's failure to stand behind its products and consider legal action. Then I called Dolmar in Georgia. They referred me to the regional distributor. I called the regional distributor three times and left a vehement recorded complaint each time (No way of getting a warm body on the phone. I guess they don't talk to individual customers - just to dealers). A couple of hours later the dealer called to say the regional distributor had approved the repair under warranty.
I hope the problem with your saw turns out to be something minor and that if it isn't, your dealer, or regional distributor, won't give you any static about the warranty, but if they do, maybe my little story will be of some use to you.