STAC
Fancy hearing about STAC again. When on the ramp as an avionic LAE or something similar, I was expected to check out and decide yea or nay on serviceability in my increasingly rare 'spare time', it was a bit of a bane but was on my 'KPI's'.
As said previously, it was avionic only with no fluid contaminated components. For avionics systems with all those 'now you see it and now you dont, faults it could work well, and many components could be quickly identified as 'S' as the same fault continued.