I have a digital line card in a Definity G3si that has stations that stopped working. The system says there is no board when there is. I have tried a busy/release(reset not available in this version), reseated the board, moved the board and it is recognized, tried to remove it from change circuit pack but had to removed all ports from associated ports then tried to remove the board from change circuit pack and it was blank. Put it back and it came up as no board again. Any suggestions?