As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEAT 27 EMERGENCY EXIT LIGHT INOP (ACFT LEFT). GROUNDED - YES. FOUND AFT F/A EMERGENCY LIGHT SWITCH SELECTED ON. ROW 27 EMERGENCY LIGHT WAS ONLY LIGHT STILL ON. ALL OTHERS LIGHTS DISCHARGED. SELECTED AFT F/A EMERGENCY LIGHT SWITCH TO OFF AT 0955AM. CHARGED BATTERY PACKS FOR 90 MINUTES REF B737-900 AMM 33-51-06 ALL EMERGENCY LIGHTS OPS NORMAL REF AMM 33-51-0.