In theory it should be replaceable if the fact [link|https://www.ebay.com/itm/333268723875|replacement proximity sensors|new_window=true] are being sold and that [link|https://youtu.be/i6NMtx73Arg|it's replaceable on the 3a XL|new_window=true]. I'm having a bit of a hard time finding the replacement guide for this specific device, but if you're feeling confident in repairing it on your own then definitely document your process for the rest of us.