Looking at your errors on loop 4, I'd say your telco was full of poop. Here's what to try with the D-channel, however. In LD 60, disable your B channels on loop 4 (if not already showing disabled). Then go into LD 96, disable your D channel (DIS DCH 6), wait 10 secs, then enable it(ENL DCH 6). Then to back to LD 60 and enable your B channels. Clear your error counters using RCNT, to clear all counters, or RCNT 4, in LD 60 also. If that doesn't work, repeat the previous procedure but before enabling the D and B channels, reseat your PRI card and check the cable connections to it. Once everything is enabled, clear your counters again. If this doesn't work, check your error counters for loop 4, call your carrier, and tell them that you reseated the card, reset the D-channel, etc and you're still showing the same errors-- bipolor violations and frame slips. If you have a red light on your PRI card, tell them you have a CGA RED alarm as well.