How do I fix my automatic transmission shift lever so it engages in PARK?

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The PARK does not engage, so my truck does not turn off all the way, and I can't remove the key. Dealer says I need to buy a $431 WIN Module and have them replace it and reprogram my keys. Mechanic friend says it could be the Neutral/Park safety switch. Google says Steering Column Gear Shift Blocker needs to be replaced. Model Years 01 & 02 had recalls on Ignition/Park Shift Interlock System. Which is it and what will it cost to fix?