Gear shift cannot be moved from Park easily

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Hi, The ignition starts correctly, but the gear shifter cannot be moved easily to Reverse or Drive. It is stuck in Park. Unlike other similar questions posted, the gear shift in my car does move from Park after some effort. I have figured how to jiggle the gear shifter to get it out of park in ~10 seconds, but sometimes it takes a lot more effort. Based on answers to other similar problems, I have already checked that my brake lights are working. Any other ideas? Thanks AJK