Short of rejecting CAB’s conclusion, what is important is conduct, incomplete analysis, and a rush to judgment. How many cable sets command boost? What is suggested by testimony of change in noise level? It doesn’t take a dunce cap to associate change in noise level with lackluster climb. Why is boost off done by mechanically pulling a handle, which loops a continuation of pressure? Why not switch off the electric pumps? No chance of jamming the boost off handle, no need to move the wheel to alleviate a stalled piston?
Not exactly an exhaustive investigation.