"Please be advised that all people who participated in the testing and sealing of Vote Counting Machines (VCMs) which registered Mar Roxas instead of Rodrigo Duterte should execute an affidavit stating the VCM machine number and the polling precinct and polling center, municipality and province. We will file an appropriate petition with the Comelec and the Supreme Court on this matter," PDP-Laban spokesperson Paola Alvarez said in a statement.