What was found
EMERGENCY LIGHTS WORK IN ON AND ARMED. ONCE BATTERIES ARE TURNED ON WITH EMER SWITCH IN ARMED ALL INTERIOR AND EXTERIOR EMER LIGHTS GO OUT. PERFORMED OPS CHECK OF EMER LIGHT SYSTEM. DURING OPS CHECK NOTED STEP 3 & 4 FAILED. EMER LIGHTS NOT AUTOMATICALLY ILLUMINATING WITH A LOSS OF POWER WHEN SWITCH IS SET TO ARM. R & R RELAYS KF125 & KF126 WITH RESULTS SAME. R & R LIGHT SWITCH (SI906). OPS CHECK INTERMITTENT, SWAPPED FWD LT & FWD RT BATTERY PACKS. OPS CHECKED. PERFORMED NUMEROUS OPS CHECKS WITH PACKS IN SWAPPED POSITIONS. ALL OPS CHECKS GOOD. COMPLETED RECHARGE PROCEDURE OF BATTERY PACKS AFTER OPS CHECKS. BATTERY PACKS TO REMAIN SWAPPED FOR CUSTOMER CONVENIENCE. REF AMM 33-50-05, 33-50-20, & 24-60-45.