What was found
L ENG FIRE WARNING L ENG OVHT RAN ENGINES TO POWER FOR APPROX 5 MIN. TAXIED A/C PER JRH NO WARNINGS COMPLIED WITH PNEUMATIC BLEED DUCT LEAK CHECK USING ALUMINUM FOIL WRAP DURING POWER RUNS NO LEAKS WERE NOTED REF B757 AMM 36-11-00-5 ALL FOIL REMOVED. B757 FIM 26-11 FT 803 COMPLIED WITH NO DEFECTS NOTED. AFOLTS CARD WAS CHANGED PRECAUTIONARY MPN 285N0028-36 S/N D1801 SEE WORK UP DATES FOR SIGN OFFS. FIRE/OH BITE CHECK WAS COMPLIED AND PNUE SYS BACK PRESSURE CHECK COMPLIED WITH ALL WITH NO DEFECTS. SEE WORK UPDATES FOR SIGN OFFS. UNABLE TO DUPLICATE DISCREPANCY AT THIS TIME A/C OK FOR SERVICE