There are no special codes for the service menu, just the normal JVC commands.
[Link: riddledtv.com]

Here are all the EFCs for your TV that work with TV code 0653 and this procedure:
[Link: hifi-remote.com]

62266 FFwd
62458 Play
62234 Display
62362 return (prev ch)
62314 OK/Select
62346 Video
62282 Closed Caption
62386 Video 1
62322 Video 2
62226 Video 3
62418 Power
62242 Channel down
62370 Channel up
62434 Video 4
62210 mute
62274 Volume Up
62402 Volume Down
62270 0
62398 1
62334 2
29410 Video 5
62462 3
62238 4
62366 5
62302 6
62430 7
62254 8
62382 9
62304 menu right
62432 menu left
29236 Favorite
29420 TV/VCR
62420 Tune
62308 Menu
62436 menu down
29316 Guide
62212 menu up
62267 Pause
62379 Record
62443 Rew

URC-2981 manual: [Link: oneforall.com]