First off, welcome to IRV2!
That small flashing light is the NET port LED for the Spyder system and is flashing fault. It's more than a fuse block, it's a controller for the Spyder. You should have a legend attached to the panel that shows what the circuit breakers are for. The first thing to try is a reboot of the system but turning off all 12v power for a minute then turning it back on. You can find more information on the Spyder panel at: Customer Support | Spyder Company
The user name is Tiffin and the PW is Motorhomes (Case Sensitive).