MAIN B undervolt

Swigert (CMP): Okay, Houston, we’ve had a problem here.
CAPCOM Jack Lousma (CC): This is Houston. Say again, please.
Lovell (CDR): Uh, Houston, we’ve had a problem.
Lovell (CDR): We’ve had a MAIN B BUS undervolt.
CAPCOM Jack Lousma (CC): Roger MAIN B undervolt.
CAPCOM Jack Lousma (CC): Okay, stand by Thirteen, we’re looking at it.

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This what started the amazing story of Apollo 13.