The hand book doesn't suggest searching on Gooogle for "code u80 on dmr-ex75eb"
It does, however, produce some interesting reading.
https://www.avforums.com/threads/panasonic-dmr-ex75-error-meassage-u80.368093/
https://forums.digitalspy.com/discussion/474190/dmr-ex75-error-u80
That seconf discussion included a very interesting reference to a capacitor 680uF 6.3v. You would need to do alittle research to make sure you get one that is physically similar. If you can, try to get a low ESR one with a good temperature rating.
Talk to a Techie if you need
askjf, December 2017
