Here are the steps that you currently need to find it. Note, however, that Facebook frequently changes their UI, so these steps may become outdated as some point in the future.
Go to the lock icon in the upper-right corner, and click See More Settings:
Click on the Blocking tab on the left, then click Edit List in the Restricted List section at the top:
You will then see a popup dialog with everyone on your Restricted List. You can also add and remove people from the list through this dialog.
Had this problem with my girlfriend, we couldn’t figure this out. For us – in July 2017 – this is how I solved it. (FB changes their UI so often, it’s difficult to post a lasting fix, but here goes) ….
On your friend’s page whose posts you can’t see, have them logged in
Have them go to your profile page
Click your Friends button
Select “Add to another list…”
See if “Restricted” list is selected for some reason. If so, then click it again to hopefully take you off Restricted List.