I've been stuck on this heroic for over a month now because there don't seem to be any people who've either reached this point or are interested. I've often asked at the fleet and asked, but nobody ever responds.
While I can't help you because I'm on a different server, there is one thing I found out that may be useful:
even after a character has finished this quest chain, he/she will remain able
to press buttons and operate consoles for the riddles and the boss fight. So helping others is still possible, even after a player completed the quests.
One minor exception to this is picking up the parts for opening the incinerator at the beginning of the second mission, but with a 4-men group, that's no more than an inconvenience.
Maybe you have friends or guildies who can help you in this way?
Best of luck!