[ChevyGuy]

The P1101: The ECM compares actual airflow based on throttle position to a calculated airflow based on MAP and MAF sensors. The ECM sets a code if it detects the actual airflow is greater than the calculated values. The entire air intake system needs to be inspected for leaks or restrictions. The exhaust system as well. It even mentions the turbo wastegate as a possible source. A number of members have experience problems with the latter.

But in this case, I'd suggest re-checking the mechanic's work.

 

[ChevyGuy]

P0033 - the ECM detects an open circuit controlling the turbo bypass diverter valve.

Make sure there's no corrosion in the connector or that mice haven't been chewing on the wires.

 

[ChevyGuy]

Checked all the connections today. Everything is in tact. Guess I'm going to have to surrender it to the dealership for diagnosis... ?

Sounds like a plan. The next part is the ECM itself - not cheap. You've reached a logical end to throwing parts at it - time to do deeper tests.