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Update: after a day of soaking with some PB Blaster and a bit more internal pressure on the spring up through the bottom access hole, the poppet popped out. No obvious damage to the spring or valve plunger, so I'll flush and reinstall. Will be a week or so until I have all the o-rings and...

Greetings, I'm a new owner of a supposedly lightly used B21 TLB (400 hours) and have recently run into a rash of hydraulic leaks which all seem related to the low pressure oil cooling circuit run off the charge pump. I did not have the tools or smarts to check the pressure in the charge circuit...