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After much wrenching and cursing, I got the plug to break free. Tried adding fluid, but, it didn't seem to want to take much at all.

I noticed that pressure was escaping at the manual override valve. Tried to tighten, but it didn't want to go too much farther. Then while manually cycling the engine up and down - with the valve closed - noticed fluid leaking out of the valve.

Is there a seal on that screw that might have worn out or broken off due to age? Can I just unscrew the valve and replace the seal? Anyone have a parts diagram?

Thanks.