As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING ENG NR 2 AND THEN ENG NR 1, NUMBER 2 ENGINE MADE A COMPLETE SHUTDOWN. ENGINE HAD BEEN RUNNING AT IDLE FOR OVER 1 MINUTE BEFORE IT SHUT ITSELF DOWN. GROUNDED - YES. REMOVED AND REPLACED THE HMU. OPS TESTS & LEAK CKS GOOD PER AMM P/P TEST REF TABLE 71-00-00.