As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING PS CHECK FOUND EMERGENCY LIGHTS INOP AT ROW 9, 10 AND 11ON THE ISLE. FOUND EPSU 12WL WITH A UNIT FAULT AFTER BITE CHECK. REMOVED ANDREPLACED EPSU 12WL IAW AMM 33-51-38. ALL OPS TEST GOOD. A/C OK FOR SERVICE.