SHS1897-25 PCBA timeline By Jorgeserrano01 Jan 1, 2007 Implementation of PN:45710 May 1, 2012 Implementation of PN:85520 (ESD issue). Period: May 1, 2012 to Jul 1, 2015 PN:85520 used in production. Jun 1, 2015 Rework start of P/N:85520 (ESD fix) Period: Jul 1, 2015 to Feb 1, 2016 Rework Aug 1, 2015 Implementation of PN: 204760 (ESD fix) Feb 1, 2016 Rework end of P/N:85520