It was announced recently that 90733 was withdrawn in December with work required that would prevent the locomotive from attending the Winter Steam Gala. This was due to the Number 1 flue failing, not a simple task to rectify.
On investigation the decision was taken to remove a further 7 flues and 8 new ones ordered. Here are a selection of images from inside the locomotive giving a taste of what is involved for our staff and volunteers.
Brick arch out of the way in the firebox, so the flues can be removed.
First things to be removed are the elements but the petticoat was in the way so had to be removed.
First 8 of the elements removed.
More elements removed, some of which are now on the floor and others still in the flu pipes.
With the elements out, all the flues removed.
90733 stands in Haworth shed – it will be a while before it is back in traffic with new flues on order.
Keighley and Worth Valley Railway News (www.kwvr.co.uk) 
Hello Well In my mind the cause of this boiler tubes could be the the locomotive is been over fired this type of locomotive was built not too be over fired and they run better with a low fire on the grate and the damper on I have fired theses Locos At Goole Depot And Maintained them too I could write a book on them yours anna j