What was found
ACRID, MUSTY ODOR PRESENT THROUGHOUT ACFT WHEN OPERATING PACKS, THE ODOR WAS MORE PREVALENT AT LOWER ALTITUDES. PER TRIAD WORK SCOPE STEP 6, PERFORM A GROUND RUN USING EACH ENGINE BLEED AIR AS A SOURCE FOR THE PACKS TO TRY DUPLICATE THE ISSUE, & ISOLATE WHICH ENG THE ODOR IS COMING FROM. REF NRWC 006-ORD-04211 ITEM'S NR 1, 2, AND 3, & NRWC 006 -ORD-04212, ITEM'S NR 1 & 2. VISUALLY CHECKED COCKPIT FLASHLIGHTS & DETERMINED THERE WERE NO SIGNS OF OVERHEAT AND / OR ODOR. COCKPIT FLASHLIGHTS OPS CHKD GOOD IAW AMM 33-51-00/600. UPON FLT CREW DEBRIEF, CREW DESCRIBED ODOR AS ELECTRICAL.TROUBLESHOT IAW FIM 21-20-00-810-801-A. CONDITION WAS FOUND TO BE TRANSITORY. NO FURTHER DEFECTS NOTED. PERFORMED 10 MIN GROUND RUN OF PACK SYSTEM UTILISING THE APU AS BLEED SOURCE. UNABLE TO DUPLICATE ODOR. PERFORMED ENG GROUND RUN IAW LMM 72-00-00-700-802, USING ENGINES AS BLEED SOURCE FOR PACK SYS. UNABLE TO DUPLICATE ODOR USING EITHER ENGS 1 OR 2. PERFORMED ENG HIGH POWER RUN IAW LLM 72-00-00-700-802. UNABLE TO DUPLICATE ODOR