As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS ON TAXIOUT, GOT FWD EQUIP VALVE EICAS MSG. CYCLED CB B11 AND NO HELP. CYCLED EQUIP COOLING SELECTOR ON OVERHEAD, CONDITION NORMAL. VERIFIED 3-4 TIMES, UNABLE TO FAULT SYS. NO EICAS MSG OR IND LIGHT ILLUMINATED. REPLACED FWD OVERBOARD EXHAUST VALVE AND OPS TESTED. OPS OK NO MESSAGES