[Observium] Not displaying temp and fan data from Cisco ASA

Hello. We're running (for now, planning to get paid) Observium CE 0.14.11.6000. I have 3 Cisco ASA firewalls v9.2(2)4. Most of the data is coming in properly from them, but I'm not getting correct data for the fan speeds and temps.

The temp graphs all show 0.0C for the temps. No lines in the graphs, etc.

The fan speed graphs have a line that _looks_ like real data, but the legend says "0rpm", and the value axis has numbers like "1.0 z", "2.0 z", etc.

Any suggestions or pointers?

Thanks.

-Pete