What was found
WHILE ATTEMPTING TO PERFORM CABIN EMERGENCY LIGHTING TASK, RECEIVED FAULT EPSU (10WL) FWD L IN UNDER 1 MINUTE. / FOLLOWING TSM 33-51-00-810-822A, REMOVED AND REPLACED EPSU PER AMM 33-51-38. DURING OPS/BITE TESTS ALL LIGHTS OPERATED NORMAL BUT RECEIVED MULTIPLE OTHER FAULTS. ESCAPE SLIDE LT/EPSU 10WL FWD L, EMER LT/EPSU 10WL FWD L, EXIT SIGNS/EPSU 10WL FWD L, FPEEPMS AISLE LT/EPSU 10WL FWD L, FPEEPMS CROSS AISLE LT/EPSU 10WL FWD L. / NOTE WHEN ATTEMPTING ON-UNIT TEST OF EPSU, ALL LIGHTS ILLUMINATE BUT ""INTERIOR AND EXTERIOR LIGHTS"" INDICATORS FLASH AFTER TEST IS COMPLETE. / ALSO NOTE, CHECKED FOR CONTINUITY OF PINS AT EPSU CANNON PLUG TO GROUND REF. 33-51-00-810-822-A STEP 4(B)(2) AND PIN -H WAS SHOWING OL ON MULTIMETER. / FURTHER TROUBLESHOOTING REQUIRED."