What was found
GROUND CREW ADVISED FLIGHT CREW OF APU FIRE. APU FIRE WARNING DID NOT INDICATE FIRE. FLIGHT CREW DISCHARGED BOTH FIRE BOTTLES AND CALLED AIRPORT FIRE DEPT. MAINTENANCE GROUNDED AIRCRAFT. MAINTENANCE INSPECTED APU EXHAUST, OIL IS PRESENT BUT NOT EXCESSIVE, NO SIGNS OF CRACKING OR OVERHEATING. INSPECTED APU COMPARTMENT, NO SIGNS OF FIRE ON APU, STRUCTURAL COMPONENTS, OR APU MOUNTS. MAINTENANCE DEFERRED APU PER B767 MEL 49-11-1A. REQUIRED PLACARDS INSTALLED. NO DEACTIVATION PROCEDURES REQUIRED. MBCB 4/27/2023. MAINTENANCE DEFERRED APU FIRE BOTTLES PER MEL 26-22-1A. MAINTENANCE PROCEDURES COMPLIED WITH. NO DEACTIVATION PROCEDUES REQUIRED. PLACARD INSTALLED. MBCB 04/27/2023. AIRCRAFT RETURNED TO SERVICE.