JP Morgan and Citicorp announced profits of $5.4 billion and $3.3 billion respectively in the second quarter of 2011. Christopher Whalen points to one area of serious risk on bank balance sheets, which is second liens or home equity lines of credit. FDIC data show U.S. banks holding $624 billion in second lien loans in the 1st quarter 2011. Core Logic data shows 11 million of the U.S. mortgaged properties - or 23% of all properties- being underwater in March 2011. Of this 4.5 million properties carry home equity loans. The average amount of negative equity for borrowers was $65,000. Whalen says the largest banks are pretending that the second liens are good because interest payments are being made. Borrowers pay only the interest for ten years on many of these home equity lines of credit. He says banks have written off $500 billion so far in assets related to housing, but this has not included much in the way of writing down second liens. If housing prices do not stabilize banks will need to make writedowns of first and second liens. Whalen says this loss is probably as large as the $500 billion already charged off by the banks. For the 1st quarter of 2011, the second liens were $136 billion for Bank of America, and it has written down $6.8 billion in 2010, Wells Fargo had $108 billion, and it had written down $4.7 billion in 2010. J.P. Morgan had $60 billion aso of the 2nd quarter of 2011. JP Morgan spokesman said the bank charged off $3.44 billion in 2010, and $1.3 billion in the first half 2011. Citibank had $46 billon in March 2010....