1982 300d Window relay?

I am troubleshooting an intermitent power window issue. Replaced the window switch on the driver's side and seemed to solve the issue. Later all four windows did not work. Tested fuses in fuse box (OK), checked contacts at both driver and passenger switches. Is there a FUSE RELAY or other item I should check before tracing the entire wiring system? I am assuming that such a relay exists...
Many thanks. --- Chris Konik
** Using Mercedessource DTC SVO conversion for over three years, yeah!
-- Columbus, Ohio

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