What was found
WHILE STARTING AT THE GATE, APU FIRE WARNING ON EICAS MSG WITH A BURNING SMELL. DEFERRED APU M PROCEDURES COMPLIED WITH IAW 49-1. PERFORMED INSPECTION OF APU FIRE WARNING IAW TASK 05-50-11-200-801-A. PERFORMED SEVERAL START CYCLES OF APU IAW 49-10-00-910-802-A & LET RUN FOR SEVERAL MINUTES EACH TIME. NO FAULTS OR DEFECTS NOTED AT THIS TIME, MEL RESTORED. END ITEM LOG PAGE 2897500 APU FIRE WARNING ON EICAS APU BOTTLE DISCHARGED. PERFORMED GVI INSIDE APU COWLING IAW AMM 49-11-01, NO DEFECTS NOTED. DEFERRED APU FIRE EXTINGUISHING SYS IAW 26-6. R & R APU FIRE EXT BOTTLE IAW AMM TASK 26-22-01-000-801-A & 26-22-01-400-801-A. MEL RESTORED.