I don't see any signs of wetness on or around what remains of the switch in the high pressure line other than traces that have migrated from nearby areas.
Near the right lower edge of your 4th photo, it looks more like where their may be some actual leakage - where the metal pipe connects to the rubber line. You might try seeing if you can tighten that nut any. You don't have to go crazy with it - it just needs to be moderately snug. That is a service connection that may need an o-ring or something. Might be best to get hoses out of a junk yard if that is the problem, but don't go with that until you can truly narrow down the source of the leak.
There are two metal lines (they look just like brake lines) along the driver's side fender in the engine compartment going to the rack assembly. Visually check around those for signs of leaks. They do corrode and develop pinhole leaks.
Check the lines going to the auxiliary power steering cooler and the cooler itself (behind the grill - just a single 'U' loop, no fins) for leaks.
Also, you might want to use a proper solvent or detergent to spray all mentioned areas totally clean and dry, and then check over a few days to look for the true source of any leak(s).
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs