how can i adjust the brakes on a 5 ton cargo truck 6x6?

So someone in the battalion we relieved drove the 5 ton with the parking brake on for the whole day.Why doesn't it work? I was thinking i could do something with the slack adjusters because the brakes might be wore down but I can't see them anywhere. The brakes work it's just the parking brake that doesn't work. can you give me an idea where to start cause it's just me and one other mechanic in our shop and our battalion is deployed all over the world so we are kinda cut off from everyone else's knowledge....thank you
M923A1 5 ton cargo truck 6x6 1987 AM general
 
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