GO:0033778:   7alpha-hydroxycholest-4-en-3-one 12alpha-hydroxylase activity
Catalysis of the reaction: 7alpha-hydroxycholest-4-en-3-one + H(+) + NADPH + O(2) = 7alpha,12alpha-dihydroxycholest-4-en-3-one + H(2)O + NADP(+).