Wouldnt hurt to do a preemptive !

Replace all fuses with ceramic ones that have copper or brass element.
2 sets from ebay are ~$10 delivered

Clean each fuse holder as you go and also check the fuse roadmap inside the fuse box cover

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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."