What was found
WHILE TAXIING "INTO POSITION AND HOLD" GOT AN UNRECOGNIZABLE SMELL. TAXIED CLEAR. SMELL WENT AWAY AFTER A MINUTE OR SO. CHECKED CIRCUIT BREAKERS, NONE POPPED. HAD TURNED FLT DECK TEMP CONTROLLER TO WARMER SETTING JUST PRIOR TO SMELL. OPERATED PACKS WITH TEMP CTRL PER AMM 21-61-00-0-4. OPERATED NORMAL WITH NO ODOR. INSPECTED CIRCUIT BREAKERS, NO FAULTS. NO STATUS FAULTS. A/C OK FOR CONTINUED SERVICE.