I guess I'm defeating the purpose if I put the computer recepts and the auxillary (printer, etc.) recepts in the same box. The site mentioned above has a pic of one sharing a housing, so I tried to use logic again...Oooops!

Yes the business shares the panel AND transformer with the doctor's office next door.

Should I take a known load and compare readings on both ends of the existing circuit? How much of a load do I need? Something steady like a light bulb, or larger, like a 1.5HP motor?

I'll tear into J-boxes and see if I can find a bad connection, incidentally, only one computer on the circuit is having the problems.

Unfortunately, my old boss did the original installation, and he is known for being maticulous. If I find a loose connection, I'll have to ask him who his helper was at the time...

Residential/Commercial Inspector
5 Star Inspections
Member IAEI