I love the music right as Wedge and Lando fly into the main reactor chamber. Was this particular sequence ever released in any of the multiple iterations of the soundtrack? I know "The Battle of Endor III" has a subsection called "The Main Reactor" but I don't think it contains that short bit of music.
Here's a clip for reference in case you didn't have the entire movie/score memorized.
That piece is tracked in from EMPIRE STRIKES BACK, from the "Losing A Hand" sequence of the climax at Cloud City, specifically when Luke is being rescued by Leia and the gang.