Examining

Bob has wiped the sweat from his forehead so he had to take his helmet off.. :-)
Problem with a pump in the "Lunar explorer" . See also this one.
This set of pumps and valves is important for the seals of the generator.
The hydrogen pressure dropped because one pump stopped and the stand by pump did not start. The emergency pump started next though, but stopped as soon as the oilpressure was OK again. Then the oil pressure dropped and the emergency pump started again.
It all sounded not good...is was like a yo-yo. Every few seconds.
Fortunately we just went off the grid as scheduled otherwise the unit would have been tripped....