The only possibilities that come to mind 1. ducati pays jack to trace a harness and repair a short. 2. appearance ,being as your bike is fairly new a harness that has been cut open and retaped is usually apparent if your looking closely its usually possible to tell due to differences in tape brands or types of shrink tubing 3. this is a ducati recommended repair for a known issue.
Ducati do not pay for "Investigation time" you get the price of the part credited back to you and a tiny amount of Labour, that is why most dealers don't want to spend any time trying to find the fault, they get no money to pay for the time, So if it takes a dealer 4 hours to find a fault, that is all lost time, gone, never to be recovered.
So in this case with Ducati's warranty system, it is worth more to the dealer to install a new loom and at least get some labour cost's back from Ducati.
It's cheaper and easier with Ducati's warranty system to keep throwing parts at it.
Ask me how I know....
And here is a classic case of how little Money you would get for a warranty repair, even though the Fault is caused by Ducati during the design and construction of the bike!!....
1098/1098s/1098r, Known Regulator issue, Proximity to Exhaust cause damage to regulator, Repair: Replace Reg and Reg Mount with new part with Heat shielding, Strip off fairing/body work, remove battery/ECU/Reg/Reg case, Install new Reg Casing and shield, install new Reg, reinstall, hook up DDS and clear fault codes, Reinstall Fairing and Bodywork, Road Test.
1 hour start to finish on average.
Ducati used to Credit back the parts and pay $30 Labour for that job!
Oh, and let's not forget it would take Ducati 90 days to give you that credit, and they reserved the right to not pay you for a claim if they didn't agree with the repair, even if the repair fixed the fault, and even if you were authorized by the Ducati Warranty manager to do the repair!