Can I use Contact Cleaner?

Hi, 

I have a Classe CT-5300 which is suffering from an intermittent fault, sometimes when it powers up it appears to not initialise correctly and it sometimes engages protection circuitry (doesn't shut down, just flashes at me). I've spoken with Classe and they say it's probably the controller module. Given that it's very heavy and the nearest service centre is in Holland (I'm in the UK), I'm trying what I can to avoid sending it in, I thought I'd pop open the lid and take a look.

I disconnected and reconnected all of the ribbon cables that connect the various amp and fan modules to what I'm assuming are the power boards. There's one cable that seems to link the external connections (can-bus, USB, remote, etc.) to the main power board and that ribbon cable was quite loose. Re-seating all those cables seems to have "resolved" the issue. Time will tell, but it was happening a lot and it now hasn't happened for a couple of days.

To my question, I'm thinking that I'd like to clean the contacts with contact cleaner. With an interconnect or a power cable I can see how this would work, but is it appropriate with a ribbon cable that connects to bare pins? I'm concerned about shorting things. Are there specific contact cleaners for PCBs and internal circuity? Should I just use alcohol and let it evaporate? Or is this just a horrible idea in general?

Even if the consensus is to send it back to Classe, I'm still interested in an answer about the cleaning.

Thanks