Welcome to the Forums! Glad to have you.
Got a chuckle out that one - my purchasing agent is a tightwad as well. I have to fill out forms in triplicate..
I bought a D5GXL in 2004 brand new. First dozer I ever purchased. Still have it today as a semi-retired machine we'll use to push the dump off or similar tasks.
The G series are good machines however they do have some quirky electrical issues if the system is not running around 14.4 volts - everywhere on the machine.
After going through all the fluids and filters, run through the batteries and alternator checking voltage. Low voltage can cause all sorts of issues on the tractor. You might think something is seriously wrong only to find out there is a battery or alternator going out.