on The List here, it shows audio pid of 52. Why would you need 5 digits?
edit : Just checked it>APID52 works on my Mercury 2 for AC3 sound.
Have you removed and rescanned the channel? I have a Pansat 1500 & 2500 and both scan it in just fine (the ac-3 pid)
Coolsat uses some funky conversion to ac-3 channels and they need a 5 digit input. You could do it via Channelmaster but the 9200 doesnt work with CM