(Reuters) - Wells Fargo & Co reported a 26% slump in quarterly profit on Tuesday, as mortgage income sank and it braced for additional legal expenses tied to a sales practices scandal that erupted more than three years ago. The bank is operating under heavy regulatory scrutiny, including an unprecedented cap on its balance sheet by the Federal Reserve, as it tries to rebuild its reputation after revealing in 2016 that it had opened potentially millions of unauthorized accounts.The bank has paid..