TM 10-3930-669-20 (9) Remove  screw  (26)  and  washer  (27)  from  oil cooler duct (28). (10)  Remove  screw  (29),  washer  (30),  and  bracket (31) from oil cooler duct (28). (11)  Remove  screw  (32)  and  oil  cooler  duct  (28) from transmission oil cooler (25). WARNING Oil  is  slippery  and  can  cause  falls. To  avoid  injury,  wipe  up  spilled  oil with rags. (12)  Loosen  screw  (33)  on  transmission  oil  cooler (25). (13)  Remove drain plug (34) and preformed packing (35) from transmission oil cooler (25) and drain oil into drain pan.  Discard preformed packing. 8-9