Yes....if you have a coolant reservoir, check to make certain the fluid level in the reservoir is at the normal "Cold" mark usually embossed on the tank.
When it falls below that, the amber MIL will illuminate on the dash. As mentioned previously, if the level is normal....you could have a bad sensor at the reservoir.
I included photos of my old sensor (leaking) and the new one I installed just for reference on my Freightliner XC Chassis.
Any dark liquid found around the bottom of a jack leg COULD be a slight hydraulic leak.
Let us know when you find out.