What was found
AT CRUISE (FL350) PASSENGERS & FLIGHT ATTENDANTS REPORTED AN ACRID, BURNING, SULPHURIC ODOR IN CABIN FROM ROW 11 TO AFT OF AIRCRAFT, WHICH DISSIPATED AS POWER WAS REDUCED ON DESCENT. FLIGHT DIVERTED TO MEM. SUP TO BE ISSUED UPON COMPLETION OF TROUBLESHOOTING AND FINDINGS. MAINTENANCE TROUBLESHOT AIRCRAFT ELECTRICAL SYSTEM WITH NO FAULT FOUND. ISOLATED ENGINES AND PACKS - NO ODOR NOTED ON 10-HOUR GROUND RUN. UNABLE TO DUPLICATE ODOR AND NO SUBSEQUENT ISSUES TO DATE (30 DAYS LATER).