J. Kissel, F. Clara Upon hearing news that LLO suspects their recent discovery of excess noise in their ESD signal chain (see LLO aLOG 13017 and 13034) is due to an older revision (V4) of AI chassis not being able to drive long signal chains (where the unique), Fil and I checked what documentation exists for ours. The serial numbers and version for our ESD AI chassis are as follows: Optic Chassis S/N Board(s) S/N Version ETMY S1103819 S1101716 V4 S1101720 V4 ETMY S1103818 S1101884 V4 S1101890 V4 So we'll need to swap these out for V6 at the earlier.