Weird noises out if VH4

hello,

today I played with my VH4 and the 2nd channel bright switch made a loud "clank" every time I push it, then it stopped but it was so strange, also when I turn the standby on it went "zzzzttt".

Since there was a fire in the place I rehearse and there was a bit of dust in it I hope it didn't ruined it somehow...also I used the thru to feed my dual rectifier, this is ok right?
 
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