Chosen Solution

Will I need to get the screen replaced? Any idea what hardware the issue is with?

Yes, the screen will need to be replaced MacBook Pro 13" Retina (Early 2015) Display Assembly and here’s the guide to do it MacBook Pro 13" Retina Display Early 2015 Display Assembly Replacement When you dropped it it hit the edge breaking the column lines on the edge of the LCD panel. Think of how fabric is woven.