I would recommend you talk with someone who actually does sub-2's. In the your Serrano, you have a limited time to attempt a Sub-2. If the NOD/ Les Pendens has been filed and if the Sale Date has already been set... the opportunity to reinstate is greatly reduced and you will have significant fees compounded on the original about owed including late fees, legal fees and court cost... often a huge % of the original delinquency.
By far the best opportunity in your Serrano is NOT a Sub-2... but doing a Short Sale.
In the Short Sale you can negotiate the acquisition price well below what the Strike Price/ Value will be. This way you can cut out the late fees, most if not all the other cost and if your good... a chunk of the mortgage amount owed.
We just completed a Short Sale on a property with $89,000 outstanding and over $21,000 in fees/ cost and $21,700 in second mortgages. We shorted the $21,700 2nd to $2,000 and shorted the $110,000 1st to $78,800. We will have about $7,500 in repairs and will probably keep it for cash flow ($750/mo) at least 18 months then sell at about $148,000.
This is almost ALWAYS a CASH type deal in Short Sales and Closing within a very short time... typically 48 hours or less.
While Sub-2 do work very well in some situations, Short Sales are almost alway a preferred way if you have the capital to tie up for the period you will be repairing/ holding/ marketing.
Key is to develop an investor database... very easy to do once you do a few of these Short Sales... these investors like to talk.