Experienced same problem yesterday on CS1000M Rls 6.00R. Saw AUD038's and AUD035's pointing to the CDR TTY. I can tell you how I cleared it, but not sure if it will come back or not. I think this might be a software bug. Just my opinion. Anyway, I added CTY to another TTY. For example, add USER CTY to the modem TTY (ADAN) in LD 17. Then add this port to CDR_DATA PORT in LD 15. Remove or X the actual CDR device TTY from LD 15 CDR_DATA, and then in LD 17 remove CTY from the CDR device TTY. Once I did this, I saw several AUD039's and AUD040's output, indicating the Call Register's were cleared. Basically I removed removed the existing CDR port programming, programmed a new one, let the system run audits and it cleared on its own. I then put the programming back they way it was previously. This is probably just a work around, but it stopped the AUD035's and AUD038's. Hope this helps.