You are right in all respects 5,6 are motor related error but when grouped like that likely false positives. 13 comm error and 14 is footer (powering up with pedal pressure) the most common cause...display or display cradle. Wipe contacts with a clean cloth (or dirty shirt tail HA) no solvent usually needed. If corroded or really dirty (sometimes moisture gets in) a pencil erasure will work. Check the contacts on the back of your display by pressing in with your fingernail, they should spring back out freely. sometimes they stick. Check the connector plug to the display. Unscrew the silver knurled locking collar and unplug, replug making sure to secure the collar. Finally make sure the display cradle mounting screws are not overtightened, the cradle should be able to rotate with slight resistance on the handlebar. Overtightening the cradle will distort it and interrupt connection. Lastly if the problem persists there may be an internal intermittent connection in the cradle. If you have a cradle with silver colored contacts seemed to be more prone, newer runs of the cradle have gold colored contacts and seem less problematic. And really lastly the display could be at fault, rare but not unheard of. PM me if this does not solve your issue we have all the parts in stock if you need anything. If it turns out to be the display we only carry the latest version new, fully compatible and larger digits for our old eyes. If you are a stickler for original we do have a limited number of used old style in white, tested good but with miles on them.