I'm working on a Cat 2EC20 serial 63469 for a customer. They left it unattended for a few months (key on) and the battery dead. I used a small 40 amp 36 volt charger to get the battery up and move the truck out of the place it was in. It worked fine once it was charged and the battery topped off. I placed it on it's own charger for an hour or so just to make sure all was ok, when I went to move it the low brake fluid light and exclamation point light was flashing. Topped off the brake fluid and freed up the sensor float and that light went out. Now the exclamation light and 39 is displayed, any ideas. It has Micro Command.