This belongs in the "gigs and collaborations" forum. Good luck, you're not offering very much for a job like that.
A squirt of contact cleaner in each switch might be easier/cheaper.Leo..
I think you should bill him for that advice.
Who will bet Chris would stall after 10 minutes... I still can't figure out the schematic posted, and it would take me at least 10 minutes of research to look up the various parts so that I understand the logic. For example, what does "wire C" from each switch to the display element do and where does the tap from C go?
$30 just gets the lid of the laptop opened - as long as it is one that is easy to open....R