TM   9-2320-273-20 5-29.  SENDING  UNITS,  SWITCHING  DEVICES  AND  WINTERIZATION  KIT MAINTENANCE   TASK   SUMMARY   (Continued). TASK NO. 17 18 19 20 21 22 LIST   OF   TASKS TASK Instrument   Relay   Maintenance: A. Removal. B. Installation. C. Operational    Check. Winterization   Kit   Circuit   Breakers,   Box, and Receptacle Maintenance: A. Removal  of  Circuit  Breakers. B. Installation  of  Circuit  Breakers. C. Operational  Check. D. Removal  of  Circuit  Breaker  Box and Receptacle. E. Installation  of  Circuit  Breaker  Box and Receptacle. F. Operational  Check. Winterization  Kit  Transmission  Oil  Heater Maintenance: A. Removal of Heater. B. Installation   of   Heater. C. Operational  Check. Winterization  Kit  Engine  Oil  Heater  Thermostat Maintenance: A. Removal  of  Thermostat. B. Installation   of   Thermostat. C. Operational  Check. Winterization  Kit  Engine  Coolant  Heater Maintenance: A. Removal  of  Heater. B. Installation  of  Heater. C. Operational  Check. Winterization   Kit   Battery   BOX  Heater Maintenance: A. Removal of Heater. B. Installation   of   Heater. C. Operational  Check. TASK REF 5-86 5-86A 5-86B 5-86C 5-87 5-87A 5-87B 5-87C 5-87D 5-87E 5-87F 5-88 5-88A 5-88B 5-88C 5-89 5-89A 5-89B 5-89C 5-90 5-90A 5-90B 5-90C 5-91 5-91A 5-91B 5-91C TROUBLESHOOTING REF  (TABLE) None 5-14 5-14 5-14 5-14 5-14 5-83