I was upgrade PBX from R6.2 to R8. Change CP and convert DataBase. All work fine.

Once day LT slot 0 in the PIM1 is blocked.
All 8 SLT phones haven't dial tone. Only LED's lights up when I try dial. Cable and connections OK.

I reset PBX, reset ports by CMEB2, reset card, clear all ports, write 8DLSP card in this slot and 8LCAA back but failed frown

How to unblock slot ?
I suppose this is error in memory. When I assign new Dterm PBX always write WRONG in CM93.

some details

PIM0
8COTR - 3
8DLCP - 3
8LCAA - 1
8RSTG - 1
30PRTA -1
30DTCC - 1
SC01(DCH) -1
CP24B R8

PIM1
8LCAA - 8
AP00B - 1

PIM2
8LCAA - 8
30PRTA- 1
CP15 - 1