I just bought an early unit (serial number below 1200) which was never used on transmit, only the receiver. I knew from prior research before buying that there were a number of factory upgrades done during production years, but have not found any kind of list describing all the problems and fixes on one webpage.

Some posters on other forums say rigs after numbers 1500, 1800, 2000 and even 2200 were corrected, but don't really say what was corrected.

Can anyone tell me what the problems were and what was the fix (or point me to a link)? The rig will be here next week so I can't say if there is anything I notice wrong with mine yet.

Thanks for any help!