Pete, thanks for the report and the images.
About the images.
Can you try to read any numbers or letters on:
Q1, Q2, Q3
D1 & D2
The numbers and letters on each device will likely be 3 characters
(such as 3F4, or something similar)
About the TZJ (cannot read for sure? it's above Q2),
Does it look like a diode?
And, TZ2 or T22 near the input connector, does it look like a diode? could be a transient protector?
Q4 and Q5, fairly sure they are regulators. Are they leaded components, like TO-92, TO-93 cases? If so, do you see any nomeclature?
A small flashlight and magnifying glass can be very helpful, also try lighting from different angles.
Thanks
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