Did this on my '92 400E about a year ago. Very cramped space in there on the
W124 chassis w/ the M119 engine.

On the 400E I had to remove the driver side rotor/wiring to get at it. Also,
there is a paper like "seal" at the bottom of the reservoir on the 400E set-up;
yours maybe different...I replaced that too while I was at it.

Took me longer than 2 hours as I was new at this and because of the cramped quarters on the W124 chassis/M119 engine combo.

I have another PS leak more recently that I have been unsuccessful in root causing and it is leaking onto my new control arm & bushings.

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Matt
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92 400E 128K
99 GMC YUKON 88K