To be quite honest, it is not worth fixing.
These RCA products are of the lowest possible quality and have extremely high failure rates. For a 2007 model, it has served its expected life many times over.
RCA does not support these products in any form, and there are no parts available.
A typical repair job would be $200+, which exceeds the price you'd pay to replace it with a brand new system from a more reputable manufacturer.
Here are some replacement models I'd suggest:
If you'd still prefer to repair, I can certainly help find a shop for you as well, just let me know your zip code.
Best regards, ***** ***** for the news,
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Thank you, ***** ***** a good day,