As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 9985. L2 DOOR LOWER RED EMERGENCY EXIT SIGN FOUND INOP DURING PREFLIGHT. PLACED ON MEL PART 91 ONLY . MEL CLEARED BY REPLACING EMERGENCY LIGHT POWER UNIT 3 REF E175 AMM 33-50-01-000/400-801-A. OPS TEST GOOD. L2 DOOR LOWER RED EMERGENCY EXIT SIGN ILLUMINATES NORMAL. RETURNED TO SERVICE.