As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINT ANNUNCIATOR ILLUMINATED ON LANDING. GROUNDED - YES. REMOVED AND REPLACED #1 ENGINE FAN AIR MODULATING VALVE IAW B737-9 AMM 36-12-03. 4 BREAKERS PULLED AND RESET. PERFORMED LRU REPLACEMENT TEST IAW AMM 36-12-00-720-801, & 46-13-02-710-801.