As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT PRESS TO TEST FUNCTION FAILED UPON PREFLIGHT CHECK. TROUBLESHOT REF MD11 WDM 33-51-01 AND FOUND EMERGENCY LIGHT PRESS TO TEST SWITCH S1-402 FAULTED, REMOVED AND REPLACED S1-402 REF SWPM. OPS CHECKS GOOD. A/C OK FOR SERVICE.