Continental Athletic Supply is a vendor on the west coast that is authorized to recondition and recertify lacrosse helmets to NOCSAE standards. Their service includes: cleaning, sanitizing, inspecting helmets for cracks or other defects, replacing faulty parts (if available, cost of parts extra), recertification to NOCSAE standards, and installation of new NOCSAE recertification sticker.
Cost is $39 for the recertification service plus about $25 for return shipping. You will also pay about $25 to ship the helmet to them. You'll want to weigh the cost of recertification (~$89) against buying a new helmet. If you don't think your helmet will pass recertification, save yourself the cost of shipping the helmet to them.