What was found
STINKY PUTRID SMELL STRONG ON ENG START UP. PILOT DEBRIEFED, MCC CONTACTED, SMOKE/FUMES REPORT SUBMITTED, COMPLIED WITH W/C 0550-2002. P-TRAK NOT USED. RAN PACKS WITH ENGINES AND APU, ISOLATED ALL BLEED SOURCES. NO SMELL OR FUMES. SUSPECT ODOR FROM OUTSIDE SOURCES. MCC CONFERENCE C/W. MSI PREVENTION PROGRAM C/W. A/C OK FOR SVC. (LP: 9398932, AIRCRAFT WAS GROUNDED)