ericsson RET disable after DTMA swap

Hi,

We encountered a problem when we swap ASC to dTMA (COMMSCOP), on ercisson RBS,the RETs become Failed.
It appears that the problem occurs on one site, on the three sectors, so on the three RETs.
I suspect the problem coming from a central point.
each RET is connected to its TMA.
I suspect the problem in the DUW
have you ever encountered this problem

thank you for your answer

Eric