After the shop changed the computer, the brake and ABS light stsy on.

I don't have scanner, shop used theirs and showed me that there was no code in computer for ABS. Believe that ABS is conrolled by a seperate Electronic Control Box?.

The abs module needs to be scanned for fault codes. I'm willing to bet the abs module will have a fault code for unknown engine control module due to the engine control module replacement. Did they install a remanufactured controller? I think either the programming of the replacement module its questionable or some simple steps like entering the vin number into the new controller was not performed.