I hope this may help those who have soldering skills and want to try their own repair.
My plug's power supply finally quit after a year of solid uptime. It started with a reboot a few weeks ago, then again several days later, then increased in frequency... It was an obvious power supply problem. I took it apart and I found three bad capacitors:
From left to right: 1) 400V, 6.8uF, 2) 400V 22uF, 3) 1000uF, 10V....
This is the power supply. It was wrapped inside an insulator within a box within another box. Three easy to replace capacitors evaporated their electrolyte from the heat. The two on the left were rated at 400 volts, but I had 200 volt caps and that's fine since we are on a 120 volt service. (120 volts peak to peak is around 180 volts...) The left was a 400V, 6.8uF and the middle was a 22uF. I replaced those two with 33uF. The diodes and fuse have no problems handling the extra capacity. The real problem was the one on the right, which was 1000uF at 10V. That one was completely toasted. I had a 1000uF at 16 volt on hand, which fit well. These capacitors are polarized, so + and - had to be on the correct side or they could explode.
I placed the power supply back on the housing shell without the protective boxes for extra ventilation. I also bent a plastic tab back to help with air flow to the external vents. Doing this may be a bad idea, considering bad things may happen if the power supply gets knocked around and touches the sheeva motherboard.
The motherboard itself was of outstanding quality and construction. The power supply not so much. It was more like a cheap off the shelf consumer power supply made to work. This repair should give more life.