Over on Delta Air Lines' Under the Wing blog, Mike Kotas provides an update of the carrier's recent modifications work in this Mod Log post.
One of these modifications is the 75E Large Lav Tank (LLT) Mod, which Kotas says Delta TechOps recently finished. "Ship 6803 was returned to service with her three aft lav tanks increased in size, to help our service during the extended trans-Atlantic flights," he writes. That modification also included installing headrests on all coach seating and satellite communication equipment.
Kotas says all Delta's 75E’s are targeted to receive the LLT mod and headrests by June 1st. You can see photos and more on Delta's blog.