Yamaha DX7 IIFD - Vintage Keyboard FM Synthesizer Working Needs Parts or Repair

Description

YAMAHA DX7 II FD
Vintage 1980s Synthesizer
I purchased this keyboard back in approximately 1984 and used it heavily for about a decade.  I'm pretty sure one-half the 1980s pop music revolved around the DX7's "tines" voice patch!  In the 1990s it was sealed up in the included soft case and has been sitting in a closet until this past month.  This keyboard works, but does have functional issues and is being sold as-is.  Please read the condition notes below.
This will be shipped packed inside a fitted soft-shell carrying case (not pictured) and heavily double-boxed to ensure it arrives safe and sound.  Please keep in mind when bidding that the shipping weight and dimensions will be large and heavy so check the shipping quotes above in this listing to see what the fees will be to your location.
CONDITON NOTES:
- Keyboard powers on, LED's light up and LCD display works fine.
- I tested all keyboard keys prior to listing and they all work fine.
- When selecting between internal voices and cartridge stored voices, the "internal" button does not appear to be working.  Since I do not have a data cartridge for this keyboard, I have not been able to test the buttons related to selecting different voices.
- The pitch-bend wheel (left most one) is loose and wobbly, but not disconnected and it still functions okay, it's just too loose.
- I have tested the audio output to an amplifier and that works just fine.
- I don't have the necessary equipment to test the foot pedal or any other inputs/outputs.
Please message with any questions you may have and I will get back to you right away.  Thanks for looking!  :)