XTM 8 very loud fan

Hello everyone
As soon as I switch on the XTM 8 the fans go straight at full speed (9000plus RPM) and they stay constantly at full speed and this results in being extremely noisy!
I read an article to fix this on a previous series
http://customers.watchguard.com/articles/Article/XTM-330-Loud-Fan-Solution-Fireware-XTM-v11-5-x

but it does not work on XTM 8.
I run Fireware os 11.10.7

Can anyone please advice on this ?
Many many thanks in advance!!

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