12 November 2013
YOU can refer to this link for TDS challan correction : http://incometaxindia.gov.in/archive/LeftMenu_ChallanCorrectionMechanism_26082011.pdf
13 November 2013
please refer this link for format of indemnity bond : https://www.caclubindia.com/experts/letter-format-for-correction-in-tds-detaisl-720075.asp#.UoMO8XCBkpc But it is preferred only in case of correction in e-challan