What was found
GLUE LIKE ODOR PERIODICALLY SMELLED DURING APU & ENG BLEED USE. OCCURRED ON GROUND WITH APU BLEED, PACK 1, & PACK 2. DURING CLIMB & DESCENT WITH ENG 1 & 2 BLEEDS, PACK 1, & PACK 2. ONLY SMELLED IN FLIGHT DECK. NOT MENTIONED BY PAX & FA DIDN`T SMELL IT. NO VISUAL INDICATORS LIKE SMOKE OR HAZE. PERFORMED ENGINE RUNS, USING BLEED 1 AND 2 FOR PACK 1 AND 2 OPERATION, NO SMELL DETECTED. USING APU BLEED FOR PACK 1 AND 2, NO SMELL DETECTED, OPS CHK GOOD. R/R HEPA FILTERS FOR CABIN/COCKPIT. NO ABNORMAL SMELLS NOTED