What was found
HEARD A POP AND FAINT SMELL OF SMOKE (PLASTIC) ON CLIMBOUT FOR A COUPLE SECONDS. APPEARS TO BE THE OBSERVER OXYGEN MASK HOUSING LIGHT. TOP RIGHT CORNER OF MASK HOUSING LIGHT STRIP IS MELTED. (FLIGHT 4761) UPON ARRIVAL FOUND OBSERVERS CREW MEMBER O2 MASK FLEXIBLE LAMP BURNT. NO OTHER DEFECTS/DAMAGE WERE NOTED. R & R OBSERVERS OXYGEN MASK COMPARTMENT FLEXIBLE LAMP PER AMM 33-13-23. PERFORMED OPS TEST OF FLEXIBLE LAMP PER AMM 33-13-00. OPS CHECK GOOD AT THIS TIME. NO FURTHER DEFECTS NOTED.