Suggest starting with a voltage check at the door switches, and a continuity check through the switches. A pass would prove 1)The circuit is good, 2) the door switch is good.
Did they both stop working at the same time? That would blow my '2 distinct problem' theory...
It appears that the 2 problem lights have independent grounds, so unlikely culprit...
1986 300E 5-Speed 240k mi.