Possible short in wiring to courtesy step lamp in lower edge of door.
Will need to check wiring in door and where it goes through to the A pillar.
The window is also powered so loom to window may be culprit but being it was not opening or closing at the time, maybe not.
Economic repair ? Oxymoron with a Mercedes. Check with a local independent repair shop , most don't want to mess with wiring problems.
Once the complete interior panel is removed you may see what needs work.
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