While painting the home I have a little time to think of things. I'm considering trying the freeze method rather than heat. I've read that it has less chance of lifting paint & decals.

Anyone tried it? If so where do you buy the stuff and also does this method come with any problems of its own?

Unsure when I'll get a chance to do T2 as if I go ahead with sale of my house, I think the mess and shellite smell might not be a big selling point on the Sale sign outside. But I'll cross that bridge when I come to it

You can get the cans of O2 from DSE, but they're about $14.00 a can, which is very expensive...I've never done this method so can't comment...From my research, if you were doing a Sys11 game, there would be a very high chance of lifting decals.  I think machines post sys11 ie T2 with a diamondplated playfield, you would be very unluckly to lift anything, but would still need to do it slowly.

If its not causing issues, or lifting massively I would leave it....Having working pins I think would be a good selling point for your house for those open for inspections!