What was found
DIRTY MUSTY ODOR THROUGHOUT AIRCRAFT. MAINTENANCE ACCOMPLISHED JC 26L00021004, 26T31049004, 26L00021002, AND 26L00021001. MAINTENANCE ALSO REPLACED THE APU LUBRICATION PUMP FITTING IAW MM 49-91-45, APU TURBINE CAVITY VENT O-RINGS IAW MM 49-91-34, AND PERFORMED A SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED.