[scottfab]

make sure before you open up the box that you know which lines are coming from the sensors on the front and focus your attention on those. Look for cold solder joints. also check for pins that may have broken or vibrated loose.

Originally Posted by zig

Scott - I appreciate the offer and I think I'll take you up on it. I didn't have to perform root cause analysis of components but after 20 years in the Navy as a Fire Controlman isolating failures of computer, radar and electro-mechanical systems I did and still do a lot of fault isolation on just about anything that's broken. Unfortuately I have no schematics or diagrams to go off of. I'll pop it open to see if I can find anything obvious but if not I'll let you know.