Patsy, I'll have to look at it more closely. I plan on sucking out the old fluid with a turkey baster and replacing it with new p/s fluid. When I do this I should see a line of sorts. I have concluded that my p/s sys. has p/s fluid, not ATF, in it. I bought a bottle of p/s fluid and it's gold in color, like the fluid in my reservoir.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member