Rob,

Well, the first thing would be a visual inspection of the top and bottom sides
of the chassis, with the power cord unplugged of course. My guess is that one
or more diodes has opened/shorted. An ohmeter check will confirm that, same
for the electrolytics. Voltage checks of the transformer will tell if it has
obvious damage.

Having said that, it would be best to replace all the diodes and rectifiers and
anything else with physical or electrical problems. My experience with
servicing gear that has taken a lightning strike or severe surge, is that there
are failed and stressed components. Some that were stressed might fail in the
near future. I used to fix TVs that had such misfortune, but after 2-3 repairs
over 6 months, it was obvious that continued repairs were beyond the point of
diminishing returns.

Hope it works out for you.

73s,

Evan