First a question. When you turn the key on and after warning lights on the RH dashboard have booted up, does it show the Words "Event Code" lit up in the RH side ..? If not these events are past events but are not present right now. They just need clearing from memory and you can forget about them.
Here are the explanations of your codes. Generally a Code is identified by 3 factors known as MID CID FMI: -
1. MID (Module Identifier) - The electronic module that registered the code.
2. CID (Component Identifier) - The Component that generated the code.
3. FMI (Failure Mode Identifier) - The mode that generated the code.
030 is the Cat Monitor System
079 is the Hydrostatic Transmission Control
248 is the Cat Datalink. It transfers information from one module to another.
819 is the Display Datalink. That's the link that transfers data from the various electronic modules to the electronic dashboard.
600 is the Hydraulic Oil Temperature Sensor.
137 is the LH Motor Pilot Pressure Sensor.
FMI 02 "Data erratic, intermittent, or incorrect". Erratic or intermittent data includes all measurements that change at a rate that is not considered possible in the real world condition and must be caused by improper operation of the measuring device or the connection to the module. Signal data from a component is present, at least intermittently. The signal is either unstable or invalid as recognized by the control doing diagnostics. Data can be correct sometimes and not at other times. FMI 02 is also used for data that is invalid, such as an invalid state of a parity switch.
FMI 08 - "Abnormal frequency, pulse width, or period". FMI 08 occurs when a frequency of the signal or the pulse width of the signal is not within the range that is expected.
If any of these is an Active Event right now I would first start looking at the harness connections for one that's been subjected to water and/or dirt in it.