2009 International Regen switch

So when I try to activate the parked regen by holding for about 10 seconds it flashes but no regen response. 2009 International Transtar 8600 with 335K miles, Penske fleet truck maintained. Also, got a right side up yellow triangle with the warn engine message along with the Level 1 indicator, noticed a reduction in power then regained itself. Hotter than a hooker in church here in Texas.

 

I felt for the first time today a loss of power when the level 1 came on, then resumed its speed. the warning triangle along with the warn engine has been coming on while at highway speeds then goes off. Set the brake, no cruise activated, engine temp 170, looks like the mechanic will make some dinero on me tomorrow. Guess we will see what codes get thrown. Also, while coming to a stop I noticed a poof of white smoke from the stack.

 

Ive had it parked since 8am today, have an appt. tomorrow but, should I have the mechanic diagnose it to see what codes are first before assuming its a plugged DPF?

 

I had this cab and chassis converted to a dump truck, it was a Penske unit, and run it part time on my days off, im a firefighter working 24/48 so I don't run it everyday.