Then I was saying a bit of a prayer to God because I felt I had tried just about everything. Then it worked - and it fixed two major problems at the same time!
On my third boat, we had a logic glitch in one of the missile tubes we were testing.
We tried documented troubleshooting. Took the readings, followed the instructions, exhausted the Fault Isolation Procedures without any improvement.
We tried manual troubleshooting, following 1's and 0's through the available logic diagrams to try to see what was going on, what was wrong, no effect.
We tried shaking all the connections. Low pressure air across the panels in case there was a dust bunny causing grounds. We even beat the relay cans with a nightstick in case something was just stuck.
The senior watchstanders decided to walk away from the problem, clear their heads, try to think of something else.
They had served fried chicken for lunch that day. I acquired some bones from the chicken, strung them on the wire from a metal hanger. Two other guys and I took the chicken and danced naked around the affected tube, shaking the chicken and a Tiki head from our shakedown cruise (Kon-Tiki, the DASO Ware God). The third guy beat on the base of a plastic bucket as a drum.
We danced at every level of the tube, then we cycled power to everything and reran the test.
Test passed.
And yet, strangely, the next time a similar fault occurred, I went to the FIP before the chicken bones... Weird, huh?