Various JV-1080 manuals and information.
There've been quite a few editors for the JV-1080 (for those not brave enough to edit patches from the front panel but it's totally possible and doable if you have the time).
Yutaka Nishimura's free editor (I'd say this is the best one to use): http://akatuystudio.com/
MIDI-Quest's oldskool editor (paid): https://squest.com/Products/MidiQuest12/Instruments/RolandJV-1080/
Coffeeshopped's editor (paid and mac-only): https://coffeeshopped.com/patch-base/editor/roland/jv-1080
Some older well-used JV-1080s can start to have worn out tact switches. They can just be replaced with any off the shelf ones, no need to pay a high markup from synthesizer repair resellers.
Digikey part # EG2533CT-ND / EG2533TB-ND
Manufacturer part # TL59AF160Q