2001 JD 750C LGP problems. Please HELP!

Hello all! I am new to the forum and relatively new to owning a 2001 JD 750C LGP dozer with around 12,780 hrs.
1st problem: Started two days ago. Dozer works like a champ for first 30 minutes of day and then goes into "Slow Mo" mode after warming up. Blade hydraulics (6 way) do not slow down though. It is losing RPMs and engine sounds like it's under a load but it isn't. The first time it done it, it would barely pull itself back to the place where I was parking it for the night. Second...

2001 JD 750C LGP problems. Please HELP!

2001 JD 750C LGP problems. Please HELP!