What was found
VERY MUSTY ODOR FROM ENVIRON SYS IN COCKPIT & CABIN. CABIN CREW REPORTED THEY DID NOT NOTICE ANY SMOKE OR ODOR THROUGHOUT FLIGHT. BURN OUT HAS BEEN REQUESTED TO CORRECT FAULT PER AMM TASK 05-51-26-800-801-C1 SECTION E. COMPLIANCE ON BURNOUT IAW AMM. NO MUSTY/DIRTY SOCK SMELL NOTICED, VERIFIED BY CREW ALSO. ODOR DIMINISHED, NO OTHER DISCREPANCIES NOTED AT THIS TIME ALL OTHER TASKS NEEDED TO BE COMPLIED HAS BEEN GENERATED WITH AN ELB IAW TASK 05-51-26-800-801-C1 SECTION E PERFORM IDLE RUN FOR MIN 5 MINUTES OF BOTH ENGINES REF TASK CARD 7200-02431-001 BLOCK 101 TO CHECK FOR ODORS IN THE CABIN. PERFORMED IDLE RUN FOR APPROX 10 MINUTES IAW AMM 71-00-00-800-808-F00. RAN PACKS FROM ENG AIR. APU BLEED OFF. CYCLED TEMP FROM COLD THROUGH WARM AND BACK. NO ODORS OR SMELLS NOTICED. INBOUND CREW WAS PRESENT DURING ENG RUNS AND DETECTED NO RESIDUAL SMELL.