The S92A had recently undergone a modification where the MBG 'Last Jet' pressure switch has been given it's own power supply to prevent un-warranted engagement of the MGB oil cooler bypass valve in certain default conditions.
This involves a new (8-gang) circuit breaker panel being fitted in the bottom right hand corner of the overhead panel. Only one CB is present out of the eight (Main XMSN Press Switch). However, whilst six CB slots are without legend two have legends; the occupied CB slot of the new MGB 'Last Jet' pressure switch power supply and...'Aux Lube Control'.
Preparation for a new electrically powered aux lube system possibly?
