Hydraulic leak - can't find the source

[AV8ing]

I've got a 337D that's been leaking hydraulic fluid from the belly for some time, usually dropping 5" to 10" puddle but only after 7 to 10 days AFTER last flight.

I've pulled up the floor and there's hydraulic fluid just about everywhere from firewall to firewall !

Many hours and a few liters of white spirits and gas later I've gotten the mess cleaned up.

So I've jacked the plane and swung the gear multiple times and can't see any leaks.

Two weeks later, I've got more fluid and a puddle under the plane.

Wash - rinse - repeat and still unable to find the source despite using mirrors and borescope ....

That said, it appears to be under or near the main actuator , but I haven't actually been able to positively confirm this.

I don't want to pull out the main actuator unless I'm 100% sure it's the culprit.

Running out of ideas - any help appreciated !