A real light bulb moment

INSUBCONTINENT EXCLUSIVE:
It the mid &70s this pilot fish is operating on IBM 370s for a financial clearinghouse in London, where Good Friday and Easter Monday are
bank holidays
The systems use a CICS system logging to 3420 tape drives, the ones with the twin vacuum chambers, and when one drive on the backup system
refuses to load tapes, Fish volunteers to come in with the engineers on Good Friday to work on it.Fish has it all figured out: He&ll get
some good overtime working on an easy fix, and he&ll still get a three-day weekend.But comes the Monday holiday, and fish and colleagues are
still working on that easy fix
They&ve replaced just about every part, some of which had to be flown in especially
Finally, one of the engineers has a bright idea
He replaces the light bulb that powers the fiber-optic sensor to pick up the metallic BoT (beginning of tape) marker
Problem solved.