We received a new CRS HOQI TIA chassis this week, which includes a new amplifier for the capacitive dampers. Marc helped me set up an SR785 to test the new chassis and it looks like everything is as expected, though not exactly as laid out in the test procedure, T2600330. 

For the PD TIAs in the first attached plot, we did a 10mV p2p tf from 100khz down to .1 hz. Input was single leg, with a 10kohm resistor on the + input. Output was differential. Overall gain was 30db, and shape matched what is shown in the procedure.

For the capacitive damper amp in the second attached plot, we did a 1V p2p tf from 100khz down to .1 hz. Input was differential and output was differential. Overall gain was 3.5db, but the test procedure says should be 9.5, however, I think this is known issue. The shape matches what is shown in the procedure.