What was found
CONDITIONAL INSPECTION REQUIRED FOLLOWING STRONG FUMES IN FLT DECK PLEASE FOLLOW TRM EC0500-01016 PERFORMED SMOKE IN CABIN/FLIGHT DECK INSPECTION IAW AMM 05-51-58-800-801-C3 UP TO STEP 1.C.(2)(L). NO OBVIOUS SOURCE FOR SMOKE FOUND. POWER RAN. DID NOTE BRIEF 10 SECOND SMOKE ODOR WHEN ENGINES STOPPED & SYSTEMS TRANSFERED TO APU POWER. TRU C1 RELAY REPLACEMENT. COMPLETED AMM 05-51-58 C. AND E. PERFORMED ENGINE RUNS ISOLATING BLEED SOURCE, PACKS, AND RECIRC FANS REF AMM 71-00-00. NO ODOR PRESENT WITH APU BLEED AND PACKS AND RECIRCS ON FOR 2 PLUS HOURS WITH NO ENGINE OPERATION. PERFORMED PART POWER TEST AND ENVIRONMENTAL TESTS AS LISTED IN AMM 05-51-58. ONLY MILD SMELL OF EXHAUST OCCURS WHEN APU IS THE BLEED SOURCE ONLY AT ENGINE SHUTDOWN, ODOR INTENSITY CHANGES WITH WIND DIRECTION. REPLACED UPPER AN... R/R TRANSFORMER RECTIFIER UNIT C1 RELAY K24017 REF AMM 24-32-09 ALL TESTS PASSED, MSG CLEARED WITH NO ACTIVE FAULTS. REF TO LP 9657829 FOR THE STRONG FUMES IN THE ADD EMP:U409294,U393679 FLT DECK CONDITIONAL INSPECTION. PARTS USED: 75-2425-3-0002,QTY :1