What was found
INSPECTION TYPE:N/A ON LANDING ROLL OUT HAD A LEVEL 3 ALERT -APU FIRE- PULLED APU FIRE HANDLE AND DISCHARGED FIRE BOTTLE INTO APU. CONTINUED TO HAVE APU FIRE INTERMITTENT INDICATION. NOTE FIRE DEP WAS CALLED OUT AND A/C TOWED. LEFT ENTRY DOOR USED FOR EMERGENCY EXIT BY CREW. PNEUMATIC STORAGE RESERVOIR DISCHARGE. REPLACED APU FIRE BOTTLE, AND CARTRIDGE AS PER (EO MD11-2620-27353-A PART B). REPLACED APU FIRE DETECTION CONTROL UNIT. PRESSURIZED L1 DOOR PNEUMATIC STORAGE SYSTEM. RECHECKED PRESSURE AFTER 10 MIN FOUND OK.