One of our customers has an Inter-Tel 3000 system that is suddenly displaying "Initializing" on every phone connected to an LR5801.06200 0x8 expansion module.

The phones from the questionable 0x8 module do work in any of the 8 ports of the main unit.

Does this sound as simple as a defective/failing 0x8 expansion module?
We service other system brands, but have no experience servicing these Mitel 3000 systems.

Any advice appreciated.