TM  10-3930-643-34 TRANSMISSION  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 6-1. Torque  Converter  Troubleshooting. MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION b. HIGH TORQUE CONVERTER "IN" PRESSURE. Step 1. Check for stuck torque converter or lubrication pressure regulator valve. Clean, replace or repair as necessary, refer to paragraph 6-3. Step 2. Check for clogged transmission oil cooler. Remove and clean, if necessary, refer to paragraph 6-9. c. LOW TORQUE CONVERTER  “IN” PRESSURE. Step 1. Check for low transmission sump oil level. Add oil to proper level, refer to LO 10-3930-643-12. If oil level is correct, proceed to Step 2. Step 2. Low  clutch  pressure,  refer  to  Transmission  Troubleshooting, If clutch pressure is correct, proceed to Step 3. Step 3. Check  external  transmission  and  torque  converter  oil  lines  for leaks. Replace as necessary, refer to paragraph 6-5. If there is no sign of leakage, proceed to Step 4. 6-3