We would have no idea why the IRS is asking for additional information on your Retirement Income. You should try calling the phone number given in the letter you received.
It could be a random thing, or they are cross-checking with the copies of the 1099's that they have, or double-checking your entries in TurboTax.
I'm sure they will tell you eventually, but it doesn't sound like anything worrisome at this point.
@riderbronc
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