I had a new alternator installed today. The sound system displays "CODE". The code wasn't on my manual and there is no card with the "CODE". Called Volvo customer service. They gave me a code, but it errorred out 3 times and system is lcked. I have waited the proscribed two hours with the key in the i position and the system power on. If this doesn't work, does anyone have a suggestion? I will not go to a dealer.