Fuses are quite interesting. They can be partially blown and still conduct and look fine. The first order of business is to change them. Unfortunately, from the description, the likelihood is that you have a cold solder joint. That is a joint where the solder did not flow properly and electrical contact is either intermittent or being rectified. There are usually hundreds of solder joints within a component and so it narrowing it down is a tough proposition. Sometimes this type of problem can be exacerbated by humidity. This is a very hard problem to hunt down for the novice and usually indicates a return trip to the manufacturer or certified repair technician.
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