thanks to all for the initial replies. The car is pristine, no service issues (other than speedometer - and grossgary was right, it does read high) to date - only scheduled maintenance at dealer, who is the one that diagnosed current problem. With no other service on car during its year in operation, this certainly appears to be an assembly glitch. Somewhere online I had seen some references to prior problems with these bolts -because they are apparently shorter than in other cars. I have no clue, didn't even know what a flywheel bolt was until yesterday afternoon but initial feedback doesn't indicate it is a recent or chronic problem. Now waiting on "Subaru regional" to authorize warranty repair. Doesn't seem to be any issue with who should cover the repair, I just wonder how you repair the car correctly after the bolt came loose and left gashes everywhere.