Were they in the Diamond District at some point? I remember visiting the shop long ago before moving to New York, I think on Broadway wasn't it? around 18th St.?, and then after B&H moved up to 34th St. in the 1990s they were in the old B&H space, which I think was on 17th St., if I remember correctly.
Maybe you're thinking of 47th St. Photo, which was near the Diamond District. Professional Camera Repair was right in the middle of the Diamond District.