You raise some good points but your condescending intro was seriously unnecessary and uncalled for.
Sure it could be symbolic. It could also be just a bio-bed. If its used as a metaphor it is a terrible one in my opinion, seeing as this is an advanced future with massive technological advancement. Why out of all people on this ship is it M’Benga doing this, never succeeding, but at no time an actual engineer, you know, like someone with 1000+ years experience, is asked to fix it? I get it that its part of his character that he is handy, but still this is medical equipment, its essential, it needs to work 100%. How would this not be escalated to relevant personel? This is not the war times depicted in the flashbacks, they have resource to do this. Also quite some time has passed since the Gorn attack.
I rather agree with one of the other posters who said its a setup for something to come.
So, thanks for your comment but seriously work on your attitude if you consider posting more than just this one comment.