Here's a fixed part.cfg file for anyone else who is unable to get the JEM lab to transmit any science, and who has EXC log spam messages when that part's right-click menu is displayed.
It goes in GameData\CxAerospace\Station Parts\Parts\Modules JAXA
https://www.dropbox.com/s/9iyask4n05rjmtr/CXA_Kibo_Lab.cfg?dl=0