Just received a GW690III on flea bay and the shutter speeds seem accurate. The counter reads 027 and the condition looks great cosmetically.

This is partially what the seller stated in his ad:

"I had this (GW690III) and the Leica camera I have listed now,
checked out by a camera shop, and they
used a roll of film checking this one out.
The photos came out great and the camera is working perfectly."

Now when I activate the shutter, I hear this pinging sound but no real vibration that I could detect. Can this be a normal variation? BTW, I have another GW690III and two GSW690IIIs and they don't have any pinging.

If this is a problem, who fixes these out of production cameras? Fuji (are they in NJ) or Precision Camera Works in Chicago?