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Looks like you've already confirmed the presence of air leakage, with the thermal imaging and the fact you can feel cold air coming from the cabinets.
Shining lights is unlikely to reveal anything meaningful; air can take circuitous routes.
The least destructive fix is likely to be cutting out the backboards of the cabinets to gain access, fixing the leaks, then making good by replacing the backboards via attaching with brackets/similar.
ectoplasmosis
what’s the best way of confirming whether there’s a draft or locating a draft behind my kitchen cabinets? I am convinced there is an issue behind our kitchen cabinets. when you open or close a drawer, you feel the cold air. plus the thermal imaging cam shows spots of c.15 degrees at the kickstand (against an average of 18-20 when pointed at the walls or cabinet doors). I have taken the kickstand off and looked but there’s nothing apparent. I have foamed some clear penetrations. there was previously another large hole which I’ve sealed. I’m convinced there must be others I just can’t see because the space is awkward to inspect or they’re covered up by the cabs. do I need to just take the kitchen out and do the job properly? I could rent a keyhole camera maybe