What was found
ELECTRICAL SMOKE IN CABIN DURING CLIMBOUT. MX C/A: MICROWAVE REMOVED AND INSPECTED, FOUND THE CANNON CONNECTOR LOOSE. NO ARCING FOUND ON CANNON CONNECTOR ON THE AIRFRAME SIDE OF THE GALLEY OR THE MICROWAVE. MICROWAVE FAILED OPERATIONAL TEST. REMOVED MICROWAVE PN 400-1338-02-L-N SN 22-10-34146 AND INSTALLED A CUSTOMER SUPPLIED "REPAIRED" MICROWAVE PN 400-1338-02-L-N SN 22-12-34653. WORK WAS PERFORMED IAW SMM 25-30-03 AND CMM 25-30-43. OPERATIONAL CHECK SATISFACTORY. NO FURTHER DEFECTS NOTED. AIRCRAFT CREW JOINED US AND RAN THE ENGINES AND APU BLEED SOURCES INDEPENDENTLY AND VERIFIED THAT THE AIR CONDITIONING SYSTEM WAS OPERATING NORMALLY, AND NO SMOKE WAS BEING GENERATED.