TLMSTRS in version 12.6 of TLMS only. The TLMSTRS version 14 works OK and can be used with 12.6 as a workaround until IBM provides a fix. Here is the text from IBM apar OA56018 ...
ERROR DESCRIPTION:
When processing a VSAM data set that is opened using the ISAM Interface in VSAM, an Abend S16E RC24 will occur after installing PTFs for new function apars OA53954, OA53955, OA55315 which require greater control of the DEB control block.
Users Affected:
Any users of old applications that were written for ISAM data sets, AMORG=IS.
User Impact:
An ABEND16E rc24 will occur when closing the data set because the call to delete the DEB does not specify the new requirement of UNLOCKDELETE to ensure integrity.
History:
The ISAM Interface in VSAM was added many years ago to VSAM so that programs that accessed ISAM data sets using an ISAM DCB could access VSAM data sets without the code in the program being changed. Adding the parameter AMP=AMORG was the minimum JCL requirement to process a VSAM data set that was converted from an ISAM data set at some point in the past.
LOCAL FIX:
If you do not run any ISAM programs, you are not affected by this issue.
If you do run ISAM programs, you can ignore the ABEND16E's or apply the ++APAR which will be available by Sept 1,2018 or remove the New Function PTFs.