As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT, FOUND ESCAPE SLIDE RELEASE WARNING SYSTEM LIGHTS INOPERATIVE ON THE L1& R1 DOORS. REMOVED AND REPLACED THE POWER SUPPLY BATTERIES IAW MM 52-73-18-04. R & R THE AUTONOMOUS STANDBY UNIT IAW WRI 52-70/0585. SYSTEM OPS CHECKED GOOD.