eloceo

Anyone come across a worn bearing type rumbling/grumbling sound at approx 1800-2000rpm, when unloading power. Can't hear it when accelerating through the band. It sounds like a worn alternator bearing (or turbo?), but according to local dealer (who says he can hear it) says its nothing to worry about until it gets worse - not very comforting. Its a December 06 VTR+ Diesel 110hp done about 6000 miles but sound has been with me since about 3000miles. Any ideas... :P