Hello!
Given your Helix LT was purchased in January 2018, a free replacement after seven years is unlikely, as the standard warranty is much shorter. However, reports from that era suggest Line 6 may have offered replacements for faulty expression pedals due to a known early issue. Your best course of action is to pursue your My Acuvue Rewards open support ticket, mentioning this historical context. Be prepared that repair options, either through Line 6 (likely at cost), third-party services, or DIY fixes, are more probable outcomes at this stage.