What was found
SMOKE/FUME - INTERMITTENT PERIODS ( 1) MIN LOG SEPARATED BY 2-3 MIN OF BURNING SMOKE SMELL PERFORMED QRH (CREW DONNED O2 MASKS) AND SMELL DISAPPEARED, CAN NOT ISOLATE SOURCE. CORRECTIVE ACTION: C/W NO GO ODI PREVENTION TASK COMPLETED AMDS WORK CARD CLASSIFIED AS TYPE ODOR SOURCED TO BLOWER FAN RELAY 8HQ FOUND ARCED ON TERMINAL L1 TO TERM 2. REPLACED RELAY 8HQ PER A321 ESPM 20-46. CHECK GOOD REF A321 AMM 21-26.