As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CUSTOMER WALK ITEM: EMERGENCY LIGHT ABOVE 27LH DOES NOT ILLUMINATE WHEN SELECTED. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK FOR POWER SUPPLY M2626 S/N 437601 IAW BOEING 737-900 AMM 33-51-06-960-805. LIGHT OP CHECK SUCCESSFUL IAW STEP 4E(6) BOEING 737-900 AMM 33-51-06-960-805.