One of those "bad" modified speakers disasters. Worth like10X less than what it is up for. https://audiokarma.org/forums/index.php?threads/speakers-with-questionable-upgrades-post-your-findings-here.835402/page-132#post-16619916
Found this lxlreight. http://www.manuals.group/results.php?search=LUXMAN%20RV%20357%20SERVIC Just found the website. Check it out before you download the manual. Welcome to AK.
Sorry about the fire. Hope no one got hurt. Been there myself. You can look for other threads on cleaning gear. Found one. https://audiokarma.org/forums/index.php?threads/cleaning-dirty-equipment.192468/ Like your avatar. Good luck.
Was trying to find this photo. The Mission's i had to recap had no high's till i recapped both. Capacitance reading was high. But the ESR of the caps was in the ohms values. Thus no real output to the tweeters.
I would replace all the electrolytics. The red and black especially. Check out this thread. https://audiokarma.org/forums/index.php?threads/what-kind-of-capacitors-are-these.507746/ in speakers. The black and red caps can fail real bad.