I have not done Librarian in about 5+ years but I have some notes that may help. You may have to change the STEPLIB for your shop and of course the MASTER name.
//*--- SCAN ENTIRE LIBRARY
//STEP010 EXEC PGM=LIBRSCAN
//STEPLIB DD DSN=SYS.LINKLIB,DISP=SHR
//MASTER DD DSN=TEST.SRC.LIB,DISP=SHR
//PRINTOUT DD SYSOUT=(R,,)
//SYSIN DD *
-OPT DETAIL=N
-SCAN /WS-FIELD/
/*
//
//*--- SCAN FROM MODULES 'AAA' TO "ZZZ' AND
//* COLUMNS 7 TO 72
-OPT DETAIL=N
-OPT MOD-STR=AAA,MOD-END=ZZZ
-OPT COL-STR=7,COL-END=72
-SCAN /WS-FIELD/