What was found
WHILE PERFORMING EMERGENCY LIGHT TEST, CIDS 1, EPSU SYS TEST FAILED. REPLACED EPSU BATTERY AT 11WL IAW AMM 33-51-38, OPS CHECK OK. REPLACED EPSU BATTERY AT 17WL IAW AMM 33-51-38, OPS CHECK OK. REPLACED EPSU BATTERY AT 13WL IAW AMM 33-51-38, OPS CHECK FAILS WITH MESSAGE -EXTERIOR LT 2/ EPSU (13WL) AFT L- EPSU SELF TEST SHOWS EXTERIOR LIGHT FAIL. SWAPPED 13WL WITH 17WL, FAULT DOES NOT FOLLOW. PERFORMED TSM 25-62-00-810-819-A. CONTINUED AT TSM 25-62-00-810-819-A STEP 4.C. CHECKED ACFT WIRING FROM EPSU (13WL) TO LT ESCAPE SLIDE/RAFT CONNECTOR 2873VC IAW ASM 33-51-02. WHEN CHECKING FOR SHORT TO GROUND FROM PIN A OF 2873VC, FOUND RESISTANCE OF 3 TO 9. MEGAOHMS. WHEN AC POWER TURNED OFF, RESISTANCE DISAPPEARS. SUSPECT RESISTANCE IS BEING INDUCED & ISSUE IS WITH THE SLIDE AND NOT WITH WIRING. USED DIODE TEST FUNCTION OF METER AND NEW SLIDE. THEY MEASURED 1.51, 1.53 AND 1.57 VDC. SLAVED IN A NEW SLIDE ON L2 DOOR, RAN EPSU BITE IAW AMM 33-51-00-710-006-A., NO HELP. CHECKED WIRING FROM EPSU (13WL) PIN F TO RT ESCAPE SLIDE LIGHT INSTALLED LT & RT SLIDE ASSY IAW AMM 25-62-44-400-007-A,25-62-44-400-803-A. PERFORMED EPSU BITE TEST IAW AMM 33-51-00-710-001-A.OPS CHKD GOOD.