I do recall that Sikorsky teamed with RK for the upgraded S76 with the IIDS, and then dropped them after serious studies by the avionics experts showed serious deficiencies in the basic design and construction of the boards and boxes. It seems that basic industry standards for robustness were simply not followed, so that the failure potential was very high, especially in a vibratory environment. I have no idea if the later RK boxes were improved.