Hope someone is more familiar with old Merc fuse boxes,

Recently pulled my fuse box to clean out the area around and behind it, and also to check on the health of the fuse box. For reference I am working on a 1991 190e 2.3. Once removed, I noticed on the undersized some corrosion, and then several pins that appear to black/dark brown. Prior to pulling the fuse box, over the last year and a half, I have experienced erratic electrical gremlins and yet none of the fuses were blown. My Issues included: Non functioning cruise control (broke sometime prior to July 2018 when I bought the car), fluctuating interior lights, erratic radio (12v constant would dip way low and then super high, causing antenna to go up and down), and recently pieced together that at some point the Aux fan magnet must have failed because a brown wire leading to the coolant temp sensor is clipped and exposed, and the fan just slowly spins at all times. Any possibility that this is in correlation with the Fuse Box? Also the plastic housing of the fuse box has what appears white oxidation all over it. Any help would appreciated.

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