"but once the MGB pressure drops below 35psi the red warning light appears and you get an audio warning. One is to then manually operate the MGB OIL BYPASS switch within 5 secs."
I am still amused that on the "all sensing - all doing S-92" the only switch that must be operated immediately (with no options if the "Dire Red Fright Light" illuminates ) within 5 seconds is not automatic - why not? - light on - BYPASS opens. Seems electrically feasible. The switch could be an override if auto switching did not occur.
The placement of the bypass switch on an overhead panel within inches of the fire ext selector switch (which is similar in marking and size) is also brilliant cockpit ergonomics.
Maybe in the "B".