Heater motor

Hi all, missus has a micra 1.0 on 54 plate. The heater has slowly stopped working over a period of time. It would work if she banged the dash or hit a road hump too fast, but this has stopped working altogether now.She has been quoted a small fortune by a local mechanic to fix due to job being 6-7 hours.
I have spent some time reading many posts on this forum, but could someone please answer a few questions please ?
1) Would I be right in thinking a 54 plate is a K12 model ?
2) To replace heater motor on K12 it is a simple 3 bolts and only K11 is a dash rip out ?
3) Would it be the fan motor or resister that is most likely or change both ?
Many thanks if you have taken the time to read this post and all replies are appreciated.
P.S. I'm away from home at present,so cannot physically check the car till the weekend
Cheers, Matt.
 
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