cl structure check

How do I get WDSC to help pinpoint the "CPD0877: WHEN, OTHERWISE, or 
ENDSELECT command expected." error in the following:
  DoUntil (&TapChkLoop='1')
    CHKTAP   DEV(&TapeDrive) ENDOPT(*REWIND)
    MONMSG   MSGID(CPF0000)
    RCVMSG   MSGQ(*PGMQ) MSG(&Msg) MSGDTA(&MsgDta) MSGID(&MsgId) +
             MSGTYPE(*LAST)
    Select
    When (&MsgId = 'CPC6778') Then(DO)
       /* Volume &2 found on device &1.  CHKTAP found a volume id loaded 
*/
       /* Is it the one we want?    */
      CHGVAR   VAR(&VolId) VALUE(%SST(&MsgDta 11 6))
      Select
      When COND(%SST(&VolId 1 1) *EQ &Prefix) THEN(DO)
          /* We got our tape, let's go on */
          ChgVar &TapChkLoop '1'
        EndDo
      Otherwise (DO)
        /* Not the right tape for this backup.  Kick it out and hope the 
right one loads. */
        CHKTAP   DEV(&TapeDrive) ENDOPT(*UNLOAD)
        EndDo  /* Volid was NOT the right one for this backup */
      EndSelect /* Checking the volumne id prefix */
      EndDo  /* CHKTAP found a tape.  CPC6778 */
    When (&MsgId = 'ROB0000') Then(DO)
      /* We've ejected every tape in the drive and have not yet found one 
- abort */
      ChkTapPgm TapeDrive(&TapeDrive) /* Alert the team */
      ChgVar &TapChkLoop '1'
      GoTo END
      EndDo
    EndSelect /* Checking messages as a result of the CHKTAP */

  EndDo  /* Loop until &TapChkLoop = '1' */

Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com