What was found
AN ACRID ODOR COMING FROM GLARE SHIELD VENTS ABOVE INSTRUMENT PANEL. RAN APU & USED APU BLEED AIR, RAN FOR SEVERAL MINUTES & NO ODOR WAS COMING FROM THE COCKPIT. RAN ENG 1 & 2 APPLIED BLEED AIR FROM BOTH ENGS FOR AN HOUR & NO ODOR WAS NOTED. ISOLATED ENG 1 BLEED AIR & LT FOR 1/2 HOUR, NO ODOR WAS NOTICED. ISOLATED BLEED AIR FOR ENG 2 FOR 1/2 HOUR, NO ODOR WAS NOTICED. NOTIFIED MX CONTROL COULD NOT DUPLICATE THE ODOR . ADVISED US TO BLOW COMPRESSOR AIR INTO ACM DRAIN LINE. LOCATED ACM DRAIN LINE & BLEW COMPRESSED AIR IN LINE. PERFORMED INSPECTION OF ACM FOR LEAKS OR LOOSE FITTINGS, NO DEFECTS FOUND. RAN APU BLEED AIR, NO ODOR NOTED. RAN ENG 1 & 2 WITH BLEED AIR, NO ODOR FOUND. RAN ONLY ENG 1 BLEED AIR, NO ODOR FOUND. RAN ENG 2 ONLY BLEED AIR, NO ODOR FOUND. NO ODOR CAN BE DETECTED. OPSS CHECKED GOOD. ALL WORK WAS DONE IAW MM 21-60-00.