What was found
DISCREPANCY: WHILE CRUISING AT 17,000 FT, THE CREW HEARD A RELAY CLICKING SOUND FOLLOWED BY CIRCUIT BREAKERS POPPING OUT FOR SEAT BELT, NO SMOKING, CALL SYSTEM AND RT CABIN READING LIGHTS. FLIGHT ATTENDANT REPORTED ELECTRIC SPARKS AND SMOKE COMING FROM THE PASSENGER SERVICE UNIT (PSU) 8 C/D. AIRCRAFT DIVERTED.