obsolete 1,2-dihydroxy-1,2,5,6,7,8-hexyhadronaphthalene dehydrogenase activity (obsolete GO:0034826)
OBSOLETE. Catalysis of the reaction: cis-1,2-dihydroxy-1,2,5,6,7,8-hexahydronaphthalene + NAD+ = 1,2-dihydroxy-5,6,7,8-tetrahydronaphthalene + NADH + H+.