2011 isx435 problem

[aalendar]

Hi, first of all, great community here.
I own 2011 prostar with isx 435 and two days ago my truck get the warn engine light and shuts off while idling,
Drove it to mechanic 70 miles and then got red shut down engine light. The mechanic pulled off codes, reset the computer and that seemed to help, I was on the way to delivery. Next two mornings when I start the truck, I have again warn engine light on and then after 30 minutes or engine warms up light cleared up. Currently in Phoenix Area looking for a mechanic.
Probobly is best to change exhaust gas pressure sensor and camshaft position sensor and if that not fixes the problem look into wiring problem.
Codes that were in the computer prior to erase were:

187 Circuit 2 for the sensor power supply. Value too low ( short to ground, low voltage )
2554 Exhaust gas pressure sensor. Intermittent or incorrect data
2374 Exhaust gas pressure sensor fault. Insufficient voltage.
778 Camshaft position sensor. Intermittent or incorrect data.
115 Camshaft signal missing. Crankshaft signal missing. Intermittent or incorrect.

At the time of deletion, all faults were inactive.
Any thoughts? Do I first try to change sensors or something else is in the play?
Thanks