What was found
AIRCRAFT GROUNDED - CABIN ODOR - ON APPROACH, VENTILATION BLOWER FAULT ACCOMPANIED BY SLIGHT MOMENTARY BURNING RUBBER SMELL. ACCOMPLISHED ODOR CARD 05-96-70, FOUND AVIONICS VENT BLOWER FAN 20HQ BURNT. REMOVED AND REPLACED AVIONICS BLOWER FAN (20HQ) PER AMM 21-65-51, OPERATIONAL CHECK AND TEST GOOD, NO SMELL NOTED, OKAY FOR SERVICE.