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Laney B1 head problem

I am having a problem with my laney B1 head.

Switches on normally
Doesn t go from standby to run mode
Both lights come one normally only one is on.
The pre amp and all knobs work fine (checked true pre out)
Cable is good, cabinet is good

Light on the cuircetbaord is on (supply 12v)
Light on the cuircetboard doesn t come on (Run)

Anyone any clue what could be wrong? IMG_20200409_155156.jpg IMG_20200409_155211.jpg IMG_20200409_155149.jpg