This box has very little to do with the actual running of the motor, If anything at all. It is mostly responsible for turning your interior light out after you lock the car, setting up the DRLs, how long the rear seat heater runs, things like that.
The ECU for the engine is called TRIONIC (kind of a portmanteau of "triple" and "Electronic" owing to it's control of Ignition, fuel and boost). Quite frankly, it is rather rare for the TRIONIC boxes to fail. Not impossible, but very (extremely, some might say) rare. In any case, you will still need to find a Saab shop to work on it. Trionic has to be mated to the car, and ONLY the Tech 2 tool (A GM standard electronic device) with Saab software can do that.
About the only other box that could cause a no start condition would be the TWICE module. TWICE stands for Theft Warning Integrated Central Electronics (Saab really liked the phrase "Integrated Central Electronics" in the '90s...). However, short of the box being totally fried (as in after a lightning hit or flood), you would receive a message on your SID, usually regarding your key not being accepted.
Codes read by a generic code scanner are only a starting point. The expertise of a mechanic who knows Saabs is needed to go with that information. There are a number of mechanics in the TSN listing for CT. You might try to contact some.
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