The Spectra radios have been discontinued for a while. They have electrolytic capacitors in them which are known to leak and eat the boards. Here's what I found on this:
http://www.open.org/~blenderm/spectra/index.html
"As these radios get older, the electrolytic capacitors can become a problem. If the electrolytic capacitors on the control head boards, radio drawer command board or RF board leak, it will disrupt the operation of the radio. Any leakage will also eat through the printed circuit board traces if left there long enough. The more common problems are radios that will not power up, get stuck in SELF TEST or give a FAIL 001 error message. Electrolytic capacitors are not the only cause of these problems, but they are becoming a fairly common cause. Keep this in mind when trouble shooting these radios."
See the following page for instructions on recapping the radios:
http://www.repeater-builder.com/motorola/spectra/spectra-index.html