As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT SWITCH (4WL) ON FWD OVERHEAD PANEL MALFUCTIONING. REPLACED EMERGENCY LIGHT SWITCH (4WL) REF AWM 33-51-01 PG 01. OPS CHECKED GOOD.PARTS USED: EMERGENCY LIGHT TEST FAILED EPSU INT LOAD EMER L SEE PIC. R/R POWER SUPPLY UNIT(11WL) REF AMM 33-51-38. OPC GOOD. NO FURTHER DEFECTS NOTED.PARTS USED: 31-3350-9-9001, QTY :1 ROTABLE PARTS CHG:TT # 1559485 SN OFF 4172 PN OFF 31-3350-9-9001 IPC REFERENCE # MFG SN OFF NOT ON AC.POWER SUPPLY, P OFF 31-3350-9-9001 8237 ON 31-3350-9-9001 1217,QTY :1