I have a 2950 with the same issue. Did you ever locate a solution for this problem. We have 2 Telephone interface cards installed in our 2950. One is a Sangoma 4 Port Analog (FXO) card. The other is a one port PRI (T1) Interface.
Do you only get the failure when both cards are installed? Have you tried running only one card at a time?
Thanks for te reply. Never had only 1 card installed -- will check that out and get back here. FYI - this message stopped appearing for a while, not sure exactly how long. I just noticed it again yesterday.
also, additional error data from display:
E1711 PCI PERR B14 D0 F2
try updating the drivers and firmware for those cards
Also try replacing the board or if you can solder simply replace the capacitors.