ISX15 - CM2350 - DOC Leak - Next Steps?

[Hermjeji]

Hi Folks. Doing my weekly checks with Insite on the units we run, the 2014 we have started showing higher differential pressure numbers on the aftertreatment history (2.0-3.5 range). It was time for it to be flow tested and baked anyways. Took it to the stealersh*t (the service lady is super nice at least), and they told me the DOC is leaking and I need a new one (6,700 CAD). I said nice, don't touch it anymore.

1. Is this a leaking DOC?
2. Is the only option 6,700 dollars?
3. No codes related to this have come up.
4. Is it worth baking the DPF and running DOC as is or am I jumping over a penny for a dollar.

Thanks for your opinions.