What was found
EMERGENCY LIGHTS ON THE AFT LOWERED CEILING PANEL, ROW 28 L/H, 26 L/H, 24 R/H, 21 R/H, 19 R/H, 17 R/H, L2 SLIDE LIGHT, AND AFT RIGHT HAND O/W DID NOT ILLUMINATE FOR A MINIMUM OF 15. GROUNDED - YES. REMOVED AND REPLACED BATTERY PACK S/N 12201, 3008, 40941, 21878, & PERFORMED EMERGENCY LIGHTS OP-CHECK. CHECK GOOD IAW B737-800 AMM 33-51-06-960-806.