2015 model, 2,600 total hrs, 1,900 traction hours.

Turn the key on, it automatically says "charge battery" and then says "maintenance required". All three LED's are lit.

Charge battery up, shows 24.6 volts, no change. Hooked it up to another known good battery, same thing.

Truck is in limp mode, will drive slowly but no lift.

Any suggestions on where to start? Thanks!