PQ74852 is a cumulative APAR fix and includes the following fixes:
PN87596 - UI Appl Trap on Visual Age
PNU0008 - Disk Queued Messages Not Freed From Memory
PNU0009 - Disk Queue REM Traps When Message Pool Is Full
PQ12298 - TQ Open/Close Performance Option Needed
PQ13693 - CS2_TRANSACT core dump after install PTF 3
PQ18134 - Cancelled App Hangs Intermittently in TQ API, Hanging DAE
PQ20754 - Running Multi-thread Data Collection application COMMSERVER
PQ22913 - Repeated Calls To CS2_TEMP_RES Results In Funny Characters
PQ31759 - TQRMU Verify Returns "Sec. Index Corrupt"
PQ32631 - TQ Init Traps Defining Queue Member Length < 19 Bytes
PQ32632 - Verify Function Needed For DAE Queue
PQ33765 - Timing-related TQ REM Trap While Stopping
PQ35212 - CS2_TRANSACT Timeout With Fox
PQ60773 - Improve Temp Res, Exception, Sema4 Handling in cs2calls.dll
PQ66040 - Autoload of a Program Can Result in CS2START_CB Trap in memset
PQ66403 - CS2_HALT_RES Traps cs2icr00
PQ74852 - Poolfree/Pooldump Traps From TELNET Session And Hangs DAE