TM  10-3930-669-20 NOTE •    Install caps and plugs on oil lines and fittings. •    Tag and mark oil lines. (2)   Loosen  fitting  (4)  and  remove  hose  (5)  from heater oil outlet (6). (3)   Loosen  fitting  (7)  and  remove  hose  (8)  from heater oil inlet (9). NOTE •  Tag and mark all wires prior to removal. •  Remove cable ties as required. (4)   Disconnect two wires (10 and 11) from heater assembly (12). (5)   Remove  three  screws  (13),  two  wires  (14), and     heater     assembly     (12)     from     heater housing (3). (6)   Place heater assembly (12) on work surface. 16-21