The key is hard to get in the switch and the buzzer sounds when the door is open with key removed.how can i fix this?

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1982 300sd (totalled) 1992 300se

I'm not sure I completely understand this post. I take it the replacement didn't go exactly as planned?

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

bobs you are right,the buzzer should not sound when key is not in ignition and key should enter switch easily,these are the only problems.

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1982 300sd (totalled) 1992 300se