As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING 11,000 BLEED 1 MASTER CAUTION. RAN EPC & AOM1 CHECKLIST AND AFTER A PERIOD OF TIME, LESS THAN 3 MINUTES IT WENT AWAY. WAS IN ICING CONDITIONS WHEN HAPPENED. REMOVED AND REPLACED AFT V- CLAMP ON NR 1 ENGINE PRECOOLER IAW AMM 36-11-04. LEAK CHECKED GOOD.