I called the IRS on that code1541....
The representative I spoke with told me two things with my refund;
1st: EIC will not be issued until the 27th
2nd: Mine has a 45 day review. A letter of explanation will follow and then you should receive your refund in this time.
The way it sounded to me, if they are "reviewing", than you will receive a letter. It appears its a random review. Or could be if your taxes is significantly different than last year. I woulldnt worry, its just frustrating .
However if you don’t use the extension make sure you select options stating your trying to get a tax form, do not select “check the status of my refund” I had to call multiple times before getting in but I did get through