As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT SYSTEM OPERATIONAL TEST WITH COCKPIT SWITCH FAILED FOR FORWARD RIGHT SIDE GROUNDED - YES. REMOVED AND REPLACED EMERGENCY POWER SUPPLY M1676 S/N 64177 AND PERFORMED SUCCESSFUL SYSTEM OP CHECK IAW B737-800 AMM 33-51-06-960-806.