If it's like the one on my 88 300SE, turn the relay upside down so the rods are facing up. Then, take a THIN regular screwdriver and insert it very gently in the middle of one of the 2 long sides of the rectangle you are looking at. On mine, the part with the rods inserts into the housing which you are now facing down. Just gently pry that housing and the part with the rods and the circuit board should slide out easily.

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Thanks,
Ron Brooks