Hello , if you sure the transistors in drive systeem are new and 100% ,second step are check the diode in system. If you check this and it is oke with multimeter it is better to swap for new. After this and truck gives C0 , check connectors from transistors to CPU board , if it is 100% oke replace CPU board for new. Test the drive motors with disconnecting of truck and only a 24 volt battery , if rotate correct without any damage it is oke. It is sure you check only the transistors , connectors , diode and least the CPU board. Nothing more can give a C0. Mayby you destroyed one transistor with assembly to truck..