Is it working completely on the AM bands?
Can you direct it with the MCP to go to a fequency above 92 to find a radio station that you know exists eg Classic FM 100.3??
Use GOTO and then 1 0 0 3 on an MCP 5500 - I cannot remember how it works on an MCP 5000 as it is quite a few years since I had one (and even more since I first needed to tune it in!)
Brian