86 635csi 99,000 miles

Been chasing a squeal and a leak from the PS system, also had bubbles when I pressed it 30 times, engine off to check level. ( Air leak )

Tightened allen head screw at bottom of pump to stop it leaking, have used this to drain pump in the past, don't know if this is a drain plug or not or if it has a rubber Oring that I missed.This does not show on real OEM.

Tightened rubber hose where it meets hard line coming out of side of PS reservoir can.

Went to back out of garage to , no PS, no power brakes either.

PS fluid leaking out of top of reservoir.

I had drained it previously and filled it correctly to 10mm below rim after 30 pumps, have done this before many times.

What's going on here?
TIA,
Jim
I