C-3PO's Red Arm In Force Awakens Explained

Spoiler Alert for Star Wars: The Force Awakens ahead. There are a ton of question marks that Star Wars fans were left with after the credits of The Force Awakens rolled. One of the questions revolving around the original characters was namely: what's the deal with C-3PO's red arm? A page about C-3PO in a companion book to The Force Awakens has recently leaked online, where some answers are given regarding the mysterious red arm. The caption reads, C-3PO is uncharacteristically quiet when it co...