I believe MAN allows landings on RWY(s) 23 with up to a 3 knot tailwind
Almost correct. The "Tailwind Component" is 5 kts. Eg, you can have a wind of 050/05 and be ok. you can also have a wind of [say] 090/10kts I haven't got the graph in front of me, so that figure may be a little "out".