Excess 401K contribution and corrected W-2c form

My wife over contributed to her 401K plan in 2019. Her employer sent her W-2c corrected form with the new amount in box 12 and updated State Income Tax in box 17. My wife's pension plan sent her 2 checks: one with the excess amount and another one with earnings on this amount. We received these checks in February 2020.

Question #1: Is there any way to enter a corrected W-2c form in TurboTax or should I just correct amounts in  box 12 and box 17 myself?

Question #2: Should I report the excess contribution amount on 2019 or 2020 Tax Return? The same question is for earning amount. How to do that in TurboTax?