With this feature, players can re-roll mods that don’t fit their build or are sub-optimal in some way. Re-engineering activities require salvage, a new resource type that is created by breaking down unwanted gear for parts. The studio is testing how much salvage is given for this activity and how much re-engineering costs. The good news is that this feature will also come with “several new epic mods” as carrots to chase.
“We hope re-engineering will be a way for neophyte and veteran Captains alike to better create equipment that matches their particular playstyles and builds,” Cryptic said.
Source: Star Trek Online