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Congrats on confirming that you have the highly desirable dual circuit brakes!
I have never worked on a short air pack but there is a stickied thread that shows how to rebuild one.
https://steelsoldiers.com/threads/new-style-short-airpack-teardown-repair-with-photos.111972/
I rebuilt my long...
Judging from the 1988 date you mentioned, the lower position of the heater air intake vent, and the flapper on the exhaust stack, it sounds like you have one of the later trucks that has the dual circuit brakes. I have no working knowledge of those other than that they have a split circuit...
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