Distuned Roland AX-Edge Pitch Bend

Dear All,

I need some help to fix my Roland AX-Edge Keytar which has suddenly developed a dis-tuned Pitch Bend. I physically have to open up the Keytar to disconnect the Pitch Bend to be able to use the keytar at the moment. In case, there is need for me to change the Pitch Bend, where can I get the part number and where do can I order the part from?

Looking forward to your positive response.