What was found
AT FL430, WHILE ACFT WAS EN-ROUTE ON AN EMPTY LEG, FLIGHT CREW RECEIVED MULTIPLE FIRE EICAS MSGS ASSOCIATED WITH AUDIO INDICATING BOTH ENGS & APU WERE ON FIRE. CREW OBSERVED APU FIRE LOOP A FAIL, RT FIRE LOOP A FAIL, LT FIRE LOOP A FAIL & FPS MX REQD MSGS. ACFT DIVERTED & DECLARED AN EMER LANDING. CABIN ATTENDANT LOOKED AT BOTH ENGS THROUGH THE CABIN WINDOWS & REPORTED THAT EVERYTHING LOOKED NORMAL. ON THE DOWNWIND TO RUNWAY 18, CONTROL TOWER NOTED NOTHING UNUSUAL IN THE AFT SECTION OF THE ACFT. ACFT LANDED & GND CONTROL REPORTED THE ABSENCE OF FIRE FROM THE ACFT. REPLACED THE DEFECTIVE PART & RETURNED THE ACFT BACK INTO SERVICE ON JUNE 20 2015.