About the only thing down there would be the quick connect fitting for the TOB. I have seen those corrode and leak and the fluid end up inside the bell housing. I would probably change the retainer at the bellhousing and the line to the master. The line is Ford 6R3Z-7A512-C. I've sometimes found that the line was leaking when bleeding the system, the air bubbles never stop because they get pulled in around the O-rings on the line.
To check for the leaking spot somewhat easily, take some brake clean spray and hose off the connections, now dust them with common baby or foot powder and watch for it to get damp and change color. That will be where the leak is.
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Monday, August 8th, 2022 AT 9:17 PM