I conversed with the (now the 'late') great Dean Kidd abt. 10 yrs ago and he said that Tek never got the 'service manual' for the 2782 to more than 'beta' thus could not be procured...
He said he had schematics and I foolishly did not ask for them then (the 2782 was working fine,(a fantastic SA even in today level of performance!)
Then the 2782 failed and Mr. Kidd was not with us anymore....
Than you so much Bob Koller and KO4BB for uploading the schematics.