Furnace problem

[MWF FEED]

New poster with a work issue. We have a Furnace bank in our semiconductor factory and the top tube has been taking longer to complete runs and the time is steadily increasing along with it. We have tried everything possible to reduce this. The load side of the tube, closest to the door is always at 100% power and struggles to reach temperature. We are assuming we have a draught somewhere and have spotted the front plate is bowed and when at 1150'C the door bows out further. To take this full panel off to beat it back into shape is going to be a nightmare and may not even go back to the proper shape it needs to be. So im here looking for hints or tips on ways to keep the panel flush. Ive attached a photo of the problem, dont have a full length photo of the bank as not in work until tomorrow.

Just after advice for how to correct it, maybe bracing it with something? IMG-20210131-WA0007.jpg (https://metalworkforums.com/attachment.php?attachmentid=390535&d=1612120591)
Attached Images

https://metalworkforums.com/images/attach/jpg.gif IMG-20210131-WA0007.jpg (https://metalworkforums.com/attachment.php?attachmentid=390535&d=1612120591) (77.1 KB)




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