HI
when the SRV indicator is RED that means ((A critical or major alarm occurs in the services))
to know the exact reason you should check the alarm in the management .
the PQ1 has 63 E1 , alarm could be by one or many channels for example due to a loss in one or many channels received signal ((T_Alos)) or a cut in one or many channels like ((TU_AIS)) .
you can have indication about what is the alarm , by checking how many broken channels in the customer side , and by checking if there is a higher order alarm (like a leaser cut in the LINE board )
regards