What was found
FLT#101, FLL-LAX. 'DURING CLIMBOUT ODOR IN COCKPIT PERFORMED COCKPIT/CABIN ODOR RECOGNITION+ISOLATION PROCEDURE FCOM PAGE 4-53, ODOR DISSIPATED WITH PACK #1 OFF (STEP P.C.) LEVEL 2 ODOR UNTIL ISOLATED, SEE PREVIOUS WRITE-UP ON PAGE 3746514; PERFORMED BOROSCOPE OF #1 ENG. RAN #1 AND 2 ENG AND PERFORMED PACK BURN. OPENED UP FLOW CONTROL VALVE OF #1 PACK IAW AMM REF 72-35-00-290-801A AND 72-31-00-290-802A. THE OPS CHECK IS GOOD. A/C OK FOR CONTINUED SERVICE. THIS CLEARS MDDR 4999919. MX-4 UPDATED. PLACARD REMOVED.