The ribbon cable almost certainly plugs into a connector on the main PCB so the small PCB should be easy enough to remove. Most repairers charge for a minimum of one hour and that is likely to be in the area of £50 to £70 plus the cost of parts.
That's why I went to PM!Not sure that's going to help the OP, but as a guess the reading isn't a linear curve? Just in case the like for like is the TKD (better to be had for similar money?).