Well after a year of the pto whining, the dealer is going to come pick it up and see if they can find anything. Hoping it won't be down long as it is my lawn mower. I will post what they find, but the finish on the gears doesn't look great.
I don't think Kubota has the correct label , they say the same label fits the older 01 series and the new 02 series, but the slots are not the same. As far as your levers I believe they are correct. The second position lever is different if you have two valves or three.
I bought a L2502 first back in January, the dealer tried doing the timing adjustment, but the tractor never ran right, they took it back and I waited a few months to get a machine that had the newer version motor.
Mine can make the noise without mowing, just stopped, but I can be mowing and it makes no noise, Mine only has 7 hours on it so maybe just needs to break in.