Dear chinmay ,
Did u check the VSWR?if yes,is it normal?
Yes u can swapp the Duplexer (DVGA,DVDA)with another one wich is working normal,and again if the plroblem will transfered means u have to replace the DVGA with new one.and swapp also the multicopler but be sure to swapp it with another one,different sector,means swapp the DVGA in sector and the multicopler in other sector to deploy them in diffirent sectors.