Off topic: problem with a Hamamatsu camera

[Pedro Camello]

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Hi all,

this morning one of my good old cameras, a Hamamatsu c4742, has started to make a strange noise after months without use.
It sounds very similar to the noise of a PC fan. Temp is ok after 3-4 hours of use (-60ºC)
Would be too risky to open the cage and have a look?
Thanks