TCD Checksum Parity Error

AIS,

This is likely due to a faulty detector flow module or ribbon cable.  It may also indicate a bad flow calibration for that module.  I would try reseating the flow module and ensuring the ribbin cable connectors are properly seated and there are no kinks or nicks in the ribbon cable.  If the problem persists, try recalibrating the flows for the module if it allows you or resetting them to factory defaults.  If it still persists you will likely have to replace the module.