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Bobcat 331 - Slew not holding, bucket not overpowering thumb, foam in reservoir

My Bobby was acting odd today...while holding a log on a slight incline, the machine wanted to slew very slowly downhill while in idle. Normally, it holds position. Also noticed bucket curl couldn't overpower thumb...
Lastly, noticed a little bit of foam in sight glass...it was hot, and while letting machine cool down, the foam dissipated.
Bad section in pump? Relief valve?
I keep the oil fresh, albeit I went with a no name big store bucket of 46.

All of these problems might be related to an air leak sound I had a couple of weeks ago through reservoir cap. I cleaned the cap...didn't appear to be the problem.

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