As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD EQUIP VALVE ADVISORY MESSAGE. REACTIVATED EQUIP COOLING SYSTEM AND FOUND NO FAULTS. ATTEMPED POWER TRANSFER GND TO APU AND APU TO GND AND COULD NOT RE-CREATE FAULT. ALSO OBSERVED VALVE LIGHT ANNUNCIATE AND EXTINGUISH WHEN TOGGLING COOLING SELECTOR FROM AUTO STBY. NEEDS FURTHER TROUBLE SHOOTING AND DEACTIVATED COOLING VALVES PER DDG 21-58-06 PROCEDURE 2. REPLACED EQUIP COOLING MODULATING VLV IAW AMM REF 21-61-06, OPS CKS GOOD.