obsolete 5-beta-cholestane-3-alpha,7-alpha-diol 12-alpha-hydroxylase activity (obsolete GO:0033779)
OBSOLETE. Catalysis of the reaction: 5beta-cholestane-3alpha,7alpha-diol + H+ + NADPH + O2 = 5beta-cholestane-3alpha,7alpha,12alpha-triol + H2O + NADP+.