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Very likely that it has developed a wiring problem. GM has a service bulletin about this problem Bulletin No.: 08-07-30-007B . Some cars have a means of manually releasing shifter . That information may be in your owners manual. This is called a "shift interlock" system.
Many cars have calipers that the pistons reequire a tool to rotate the piston back to its starting position. This I have seen only on the rear brake calipers. This enables adjustement for the park brake as the brake pads wear.
Cannot be nothing other than a guess in this forum. Recommend you get it to a good honest technician on that one. Here are some the things that are possibly causing problem. Not a extremly tought diagnosis for many techs. Axle Actuator Ground Front Axle Actuator Power Front Axle Actuator Wiring Front Differential Transfer Case Control Module (TCCM) Transfer Case Control Module (TCCM) Connector
Sounds like you have a fan motor pulling too many amps. Cooling fan motors should not draw more than 13amps running on high.
You need to get that in and have it checked. Those are malfuntion warning lamps.
Did the tow driver see the loose or leaking oil filter? Next how often do you get your oil and filter servericed? Is it at regular intervals of 3000 or 50000 or more miles? What gaskets do they say blew? I agree it seems a bit suspisious that it happened right after oil change....but how soon did this happen? It is possible that the filter was loose or even more likly is wrong filter could be installed and leak or often the gasket that was on the filter that was taken off stays stuck to engine and when new filter is installed. 2 gaskets don't work and cause a leak. Accidents happen and most of the time are honest mistakes.
Are you planning to do it yourself? Not sure of your question.
Too many differant things could cause your problem. I would be guessing and that won't help you. Best thing to do is take it to a good repair professional that you get referals about from friends, coworkers, etc.
Most of these require a little diagnosis first but many times the ignition lock cylinder is what fails.
I think this site has a estimating funtion at the top of the page.