how do i buy second position debt from bank

[Rachel Kim]

Hi.. I'm  interested in buying this property at a trustee auction. I have read people  buying second position debts to use for credit bidding. I am actually interested in winning the property but if i don't  and it goes above the auctioning banks debt i should be able to collect the debt just purchased.. am i correct? ?.. so i don't  know how i go about possibly getting to buying this.. do i call the bank in  question and ask to speak to someone that can  do this or is there  another protocol or department ?. . Also when I'm credit bidding and auction ends at say 10k over auctioning lender debt amt  and my second position debt  i purchased is 10k   am i only to pay full amt of winning bid minus the 10k?