[Test-Equipment] Tektronix Service Locations?

[AB3L1 at aol.com]

I have become the owner of a 492 Spectrum Analyzer with an unstable  display. 
I figured that I might have to locate a repair facility if I can't find  the 
trouble in reasonable time. 
 
Starting at my Pittsburgh, Pa. location is there anything reasonably close  
to me that I could deal with? It is a bit heavy and can see a hefty shipping  
bill alone just to get it there.
 
Thanks,
 
Bob AB3L