Hi Al!
I'm looking at testing the power supply now. Per the Wadia documentation here:
http://www.wadia.com/ContentsFiles/Wadia%20121%20Brochure%20web.pdf
• Multiple stages of regulation were designed into the main circuit board to ensure quiet,
stable DC power is available for all sensitive circuits.
• A dedicated voltage regulator for the master oscillators is used to provide clean pure
DC power for maximum clock stability.
I wouldn't know where to start testing those pieces and do not want to dig around inside of the unit.
On the repair bill they stated that the internal power supply was replaced as well as an IC.
My aim again with all of this is to get some measurement of the issue prior to sending it back to them.