The App's hardware page has status registers that so red or gray circles to indicate different statuses related to the CAN bus. They are divided into Status, Control, Error each with a number of flags. There does not seem to be any support documentation indicating the meaning of any of the flags. If anyone has any idea I would love to know.
The CBT is really just a cleanly implemented pcb that has 3 x MCP2515 chips and a programmable MCU to make them do stuff. The register flags you are asking about are results from the MCPs normal operation and can be explored in greater detail by reading the MCP2515 datasheet available from Microchip and also peering at the CBT's PCB design.
I'm not going to deny that. I've been slammed by life but I continue to spend all my free time on the project.