What was found
RUBBER/ELECTRIC SMELL WHILE AT ALTITUDE COMING FROM MID CABIN AREA ROWS 19 - 27. RAN SMOKE OR FUMES OR FIRE ELECTRICAL CHECKLIST SMELL DID NOT DISSIPATE UNTIL LATE IN THE DESCENT FOR EMERGENCY DIVERT. MTC REMOVED CEILING PANELS FROM MID AREA INSPECTED CABIN LIGHTING/READING/CALL LIGHTS/BALLAST/AC DUCTS/O2 GENERATORS/WIRING/VIDEO MONITORS/PES EQUIP/OVENS/COFFEEMAKERS. RAN BOTH PACKS ON APU AIR THEN PERFORMED HIGH POWER RUN WITH BOTH ENGINES AND RAN PACKS ON ENG AIR. PERF W/A OF EXT A/C PACK BAYS/WHEEL WELLS/EE COMPT/CARGO/INSP EQUIP COOL ALL CHECKS OK. COULD NOT DUPLICATE.