Is it correct that these can all be used in conjunction, to generate a whopping 7 engineering points?
Neb B-Escort: Repair dial + Repair token + Engineering Team + Redemption
I don't see why not. They're all allowed as far as I can tell.
I couldn't find anything preventing it, either. But it felt too good to be true when I discarded two damage cards and redirected a shield in front of the exposed facing. Guess it's just the shock of uncovering combos in a fresh system.
Yeah I hear you 
I imagine it's so powerful because Redemption only triggers when it's actually a full command and not a token?
Yeah I hear you
Actually I think I might be wrong. I think Redemption triggers even off a token use. Wow.
I think so too.
But I guess Nebs really do need the help considering those squishy side values they have.
I think Redemption's ability can only apply to other ships, though, because of the way the range for its ability is described.
Redemption's ability (emphasis mine): When a friendly ship at distance 1-5 resolves a repair command, it gains 1 additional engineering point.
Rules Reference on Range and Distance (page 9):
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The following terms are used when discussing range and distance:
◊ At: If any portion of a hull zone, base, or token is inside a specified band, that component is at that band.
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◊ Minimum–Maximum: This abbreviation encompasses the minimum band, maximum band, and all bands in-between, such as “distance 1–4.”
So Redemption would actually be at range 0 from itself, and not at range 1-5 as required for its ability. But if you had another Nebulon-B in range of Redemption, then this could work for that one.
In X-wing a ship is at distance 1 of itself, so things like that (that don't specify 'other ships') usually effect the ship itself.
Until we get an FAQ i'd say Redeption effects itself.
A ship can consider itself friendly, not sure where the source for that is though.
Its stated in the Rules Reference. A ship is considered to be friendly and at distance 1 of itself. You'll notice Howlrunner specifically says another friendly ship, so she doesn't give herself the extra die.
Page 6 of the RRG.
"A ship or squadron is considered friendly to itself and can be targeted by effects that that specifies a friendly target unless it explicitly specifies "another" Friendly ship or squadron"