finalschecksplease
The S76C doesn't have a DECU. It has Arriel 1S1 engines and the only real difference between it and the 76A++ is that A++ is an upgraded A+ (gearbox beef up), whilst the C was built as a C from scratch and has the more powerful gearbox installed on the production line.
Yes all C+ models have DECU as they have the Arriel 2S1 engines fitted. The older models were fitted with conventional engine instruments and DDR (DECU digital readout) and the IIDS came along later.