What was found
FUEL OR BURNED RUBBER SMELL RETURNED AFTER PUSHBACK AND ENG ST ART SMOKE/ODOR QUESTIONAIRE ATTACHED COMPLIED WITH AMM TASK 05-51-58-910-801-C1 FROM STEP 1. A TO STEP 2. INITIAL OPERATIONAL CHECKS THRU C 2 U. COMPLETED SMOKE/ODOR IN THE FLIGHT DECK AND/OR CABIN CONDITIONAL INSPECTION REF AMM TASK 05-51-58-910-801-C1. FOUND DEBRIS ON ZONAL DRYER FILTER. REMOVED AND REPLACED FILTER. REF AMM 21-70-00. FOUND DEBRIS ON HIGH-EFFICIENCY (HEPA) FILTER. REMOVED ADD 414123, U243593 AND REPLACED HEPA FILTER. REF AMM 21-25-02. PERFORMED ENGINE RUN AND AIRCRAFT TAXIING. OPS CHECK GOOD. NO DISCREPANCY OR ODORS NOTED.