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1996 993 harmonics at 3500 rpm

Engine

Vehicle Information: Model: 993; Year: 1996; Body Type: Coupe; Total Mileage: 90,000;

I just had the belts replaced and now hear harmonics when accelerating. It is loudest at 3500 rpm then goes away as the rpms increase. I have only put 100 miles on the car since the service. Should I take it back or let the belts break in?Thanks.

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