So, spare key used to work, has not for a while.
Took it to pieces, removed "PCB" turned it over and copper lines had breaks in them - bought a pen from Maplin that contains conductive paint. Spread the paint onto cardboard and used a broken toothpick to apply. It went all over the show so used isopropyl alochol to "rub it out" and then build it up and rub it out until it was as good as i could get it without crossing/fouling contacts with another printed bit.
Guess what, it only bloody worked!
Took it to pieces, removed "PCB" turned it over and copper lines had breaks in them - bought a pen from Maplin that contains conductive paint. Spread the paint onto cardboard and used a broken toothpick to apply. It went all over the show so used isopropyl alochol to "rub it out" and then build it up and rub it out until it was as good as i could get it without crossing/fouling contacts with another printed bit.
Guess what, it only bloody worked!