TM 1-1520-238-T-5 7–73 7–17. OIL BYP PRI HYD INDICATOR – IS LIGHTED 7–17 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer (2) References: TM 1-1520-238-23 WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. 1. Check primary hydraulic manifold pressure dirty filter indicator. Is indicator retracted? YES Go to step 2. NO Replace primary hydraulic manifold pressure strainer (TM 1-1520-238-23). 2. Check primary hydraulic manifold return dirty filter indicator. Is indicator retracted? YES Go to step 3. NO Replace primary hydraulic manifold return strainer (TM 1-1520-238-23). 3. Check for short between P18–69 and ground. Does short exist? YES Go to step 4. NO Replace pilot caution/warning panel (TM 1-1520-238-23). 4. Detach P239. Check for short between P18–69 and ground. Does short exist? YES Repair shorted wire between: P18–69 and P914–B5, J914–B5 and P239 SP1, P239 SP1 and P239–12, P239 SP1 and P239–14. Go to paragraph 7–10. NO Go to step 5. 5. Check for continuity between (HP1): J6–13 and J6–14. Does continuity exist? YES Replace primary hydraulic manifold pressure dirty filter indicator (TM 1-1520-238-23). NO Go to step 6. 6. Check for continuity between (HP1): J6–11 and J6–12. Does continuity exist? YES Replace primary hydraulic manifold return dirty filter indicator (TM 1-1520-238-23). NO Go to step 7. 7. Check for short between (HP1)J6–14 and chassis ground. Does short exist? YES Go to step 8. NO Go to step 9.