As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLOSHING EMERGENCY LIGHTS SYSTEM TEST I GOT A MX MESSAGE. EPSU INT LOAD FWD LT FURTHER TROUBLESHOOTING REQUIRED. REF AMM 33-51-00-710-001-A ACCOMPLISHED BITE OF EMERGENCY LIGHT EPSU'S REF AMM 33-51-00-710-001-A, OP CK OK, COULD NOT DUPLICATE FAULT AT THIS TIME.