Around 30 had failed the test by Friday afternoon.
Wills-Rawlings said four members of the Laser Electrical team had been on hand throughout the day, with volunteers from Safer Whanganui also pitching in.
"We've got our own operational Green Watch crew, along with Black Watch guys from around the central North Island giving us a hand.
"Fitzies Bakery provided some food, so a big thank you to them, and thanks also to the Castlecliff Community Trust and Citizens Advice Bureau."
Morehu Bartlett, from Laser Electrical, said the blankets were first checked over visually to see if there were any defects or cracks in the case or the wire itself.
"Then we put it through our machine, which tests the insulation so that the wires inside aren't touching, which could cause a short circuit," Bartlett said.