hello 
It’s the scenario 2 the right counting method. you can see on the bottom the pin 3 is going to ground plane and the pin 2 from the decoupling capacitor C36 + pin 13 to the ground plane like on the schematic.
I hope it will work I’ve got only one case where a standard LCD was not working with a Roland product. It was with a MC50 MKII.
after some search this could be another source:
HERE
but it will requires very high skills with fine pitch fpc. (or with 0.5mm PCB adapter)