Replacing right side PCB

Hi everyone
Having acquired a used mpc k, several faulty buttons made me decide to replace the PCB. I know there are 3 ribbons to gently remove but I can't figure out how to detach the pads' connector (lower left of the board). Any tips?
Thanks.
Z

Well I found it thanks to Jojo!
http://stuff-i-do.peek-a-boo.at/mpc-service/

glad it helped you my blog address changed, just in case somebody tries to follow the link you posted. it is now: https://blog.jojotodos.net/mpc-service
all the best
Jojo