There is another way. First of all, what is the status of TTI? If on and not 100% translated it can cause this specific type of corruption. Perform a list config all and find the last 'p' port. Display the port to find out the extension (typically an analog device). Disable TTI. See if you can delete the station. Enable TTI. Validate it completes 100%. Disable TTI. Validate it completes 100%. Make sure your System Parameters Maintenance is configured to not save translations if corrupted. Save translations. Schedule a reset system 4 to "clean up" the system.
If this doesn't work, disable TTI. Make sure it completes. Reset System 4 then remove the station. Enable/Disable TTI and verify it completes 100%.
While I've never gotten AT&T/Lucent/Avaya to admit it, TTI can be the root of so many problems. Especially corruption.
There are actually a couple of different ways to corrupt an analog station. Provision had this problem several years ago where input was not validated and the OSSI interface permitted an "A" where an "a" should have been used causing the exact same issue you are experiencing.
Also, if you have gateways/cabinets which have been pulled out but translations are still in the system GET RID OF THEM!