I finally got through testing SP3 and got it installed on the server. It ran for about a week and a half and then abended. The following is the header of the abend

Novell Netware, V6.5 Support Pack 3 - CPR Release
PVER: 6.50.03

Server WHSNW2A halted Sunday, 24 July 2005 6:59:32.987
Abend 1 on P00: Server-5.70.03-2846: Server Abend initiated due to address space cleanup failure.

CS = 0060 DS = 007B ES = 007B FS = 007B GS = 007B SS = 0068
EAX = 7E04B5C0 EBX = B700CC60 ECX = 0000000A EDX = 00000001
ESI = 0013E87C EDI = FCE1C6D6 EBP = 00000000 ESP = B700CC5C
EIP = 00229A74 FLAGS = 00000246
00229A74 83C404 ADD ESP, 00000004
EIP in SERVER.NLM at code start +00026094h

The violation occurred while processing the following instruction:
00229A74 83C404 ADD ESP, 00000004
00229A77 892DE0084200 MOV [SERVER.NLM|terminatorRunning]=00000001, EBP
00229A7D EBDC JMP 00229A5B
00229A7F 8D8424B8020000 LEA EAX, [ESP+000002B8]
00229A86 50 PUSH EAX
00229A87 A1CC084200 MOV EAX, [SERVER.NLM|ProtectionFaultNoRestartInterv
00229A8C C1E002 SHL EAX, 02
00229A8F 89C3 MOV EBX, EAX
00229A91 C1E004 SHL EAX, 04
00229A94 6A00 PUSH 00

It appears to be the same issue just causing an abend now instead of just failing to clean the address space and moving on in life as before.
Patches that were applied are:

NW 6.5 SP3

TITLE: Xsession Vulnerability Fix
TID #: 2971566

TITLE: Post-6.5-SP3 fixes for XNFS (NFS Server)
TID #: 2971125

TITLE: GroupWise 6.5 NetWare Target Service Agent
TID #: 2971749

TITLE: Updated syscalls.nlm for NetWare 6.5 SP3
TID #: 2971458

TITLE: NWFTPD.NLM Oct 2004 Enhancements and Fixes
TID #: 2970119

TITLE: Updated NCP.NLM for NetWare 6.5 with SP3.
TID #: 2971792

TITLE: NetWare 6.5 SP3 Updated SERVER.EXE
TID #: 2971567

TITLE: NetStorage Post 6.5sp3 patch
TID #: 2971833

TITLE: Post SP3 NSS modules for NetWare 6.5
TID #: 2971622

TITLE: eDirectory for NetWare & Win32
TID #: 2971156

TITLE: Updated CONNMGR.NLM for NetWare 6.5 SP2/SP3
TID #: 2971121

TITLE: NetWare 6.5 SP3 and VO NPM
TID #: 2971070

Any help much appreciated