What was found
MCO FLT 1458 DURING CRUISE, EN ROUTE FROM FLL TO PHL, CREW REPORTED TO DISPATCH VIA ACAR'S THAT A PASSENGER AND A FLIGHT ATTENDANT SAW SPARKS COMING FROM BENEATH THE PAPER TOWEL RACK IN THE AFT LEFT LAVATORY. THE FIRST OFFICER ALSO CONFIRMED SPARKS FROM THAT AREA. CREW DECLARED AN EMERGENCY AND DIVERTED TO MCO. FLIGHT LANDED WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE. MAINTENANCE DISABLED AFFECTED WIRE BUNDLE, BLOCKED THE LAV AND PLACED IT ON MEL. MAINTENANCE REPAIRED BROKEN WIRE BEHIND TOWEL RACK AND RECONNECTED HARNESS. REMOVED MEL.