Rtr0550 tiller started making noise during my last use. It’s only 2 years old and this is probably the 5th use of it. So not a ton of hours on it. The noise seems to be coming from the chain drive. Everything seems to operate normally but I stopped because I didn’t want to make a possible bad problem worse. I hope the chain just needs tightened. Does anyone have info on how to do this? I found information on other models but not the rtr0550.