88 Extended USD Remove float valve mid point on right wing P/N159SC-P-006 S/N 1010. Work IAW CHB MM 28-02-00 Positioned new float valve in place, P/N 1159SCP006.1, S/N 4771, and tightened mounting screws. Moat valve will have to be removed in order to install 3 o-rings that are to he placed under mounting scr