I have been searching for a complete list of error codes, LED Status, and terminal.
My APM2 no longer shows any signs of I/O, via 3DR radio or USB; both functioned up until today, this unit has not yet been taken into the field.
It is my belief that my USB connection may have overvolted the devices. Both TX Led's stay solid under any circumstance. The doc's and wiki's explain not to supply more than 6 volts to the APM2, however in my experience USB/2-3 average 8 volts. If anyone can straighten me out on this issue I would be grateful. :)