wheres the modulator valve in a 88 Acura Legend?

bought a piece of crap legend after my New Yorker burst into flames. which is common i hear. trouble is this, the transmission is slipping like
crazy, which is also common i hear, and im told to flush the modulator valve to see if the problem improves. but where is it? i cant find a maintance guide anywhaere and a straight forward answer would greatly be appreaciated
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