Query via linked server to DB2/NT gives different results

Question

I have a DB2 9.7 database I need to query. I'm testing from four separate SQL Servers.
ServerA - SQL 2012 SP2
ServerB - SQL 2012 SP1
ServerC - SQL 2012 SP1 CU1
ServerD - SQL 2012 SP1
I set up a linked server from ServerA. I run QueryA, and am happy with the results.
I create a linked server from ServerB. I run QueryA and get the message, "Error converting data type DBTYPE_DBDATE to datetime."
I did the same test on ServerC. It works fine.
If, inside OPENQUERY, I convert the datetime to a varchar, call it QueryB, it mostly works, but will be missing a small percentage of datetime values from that converted column when run on ServerB. If I run QueryB on the on ServerA, those missing
values are there. Same for ServerC.
At this point, I can think only that the main difference is the service pack and CU level. I can't find any documentation on updates that are relevant, but doesn't mean much.
Then, I did the same test on ServerD. ServerD is at the same SP/CU level as ServerB. ServerD worked just fine. Apparently it's not the service pack or cumulative update level making the difference.
My setup: On each server I loaded MS OLE DB Provider for DB2 Version 4.0. I used the same sp_addlinkedserver script with the same connection string on each server. QueryA and QueryB both used OPENQUERY. They were identical except for the CAST to varchar
for a datetime field. This CAST became a call to a function VARCHAR on the DB2 server in later tests with the same result. 
Of course, the only place I actually need this working is ServerB.
tia,
Steve

Answer 1

Sure, with some obfuscation and shortening.
On each server, (except the first where I had to figure it out), I went through the same process.
Load MS OLE DB Provider for DB2 Version 4.0 version 9.0.1390.0
Run the Create Linked Server query
Run QueryA.
Only on ServerB has this been a problem. 
--Create Linked Server
EXEC sp_addlinkedserver
@server='LinkedServer',
@srvproduct='Microsoft OLE DB Provider for DB2',
@catalog='DBName',
@provider='DB2OLEDB',
@provstr='Provider=DB2OLEDB;User ID=Username;Password=Password;Initial Catalog=DBName;Network Transport Library=TCPIP;Host CCSID=1252;PC Code Page=1252;Network Address=127.0.0.1;Network Port=50000;Package Collection=MSDB2COL;Process Binary as Character=False;Units of Work=RUW;DBMS Platform=DB2/NT;Use Early Metadata=False;Defer Prepare=False;DateTime As Char=False;Rowset Cache Size=0;Datetime As Date=False;AutoCommit=True;Authentication=Server;Decimal As Numeric=False;Derive Parameters=True;LoadBalancing=False;Persist Security Info=True;Cache Authentication=False;Mode=Read;Connection Pooling=False;'
--QueryA
SELECT * FROM OPENQUERY(LinkedServer,'
SELECT [ARRIVAL]
      ,[ACCT_CODE]
      ,[ACC_EVENT_ID]
      ,[TRANS_DATET]
      ,[AVAIL_DATE]
      ,[AVAIL_STATUS]
  FROM [DBName].[UserName].[TableName]
') AS TableNameLink
--QueryB
SELECT * FROM OPENQUERY(LinkedServer,'
SELECT [ARRIVAL]
,[ACCT_CODE]
,[ACC_EVENT_ID]
, CAST([TRANS_DATET] AS VARCHAR(26)) TRANS_DATET
,[AVAIL_DATE]
,[AVAIL_STATUS]
FROM [DBName].[UserName].[TableName]
') AS TableNameLink
--QueryC
SELECT * FROM OPENQUERY(LinkedServer,'
SELECT [ARRIVAL]
,[ACCT_CODE]
,[ACC_EVENT_ID]
, VARCHAR([TRANS_DATET]) TRANS_DATET
,[AVAIL_DATE]
,[AVAIL_STATUS]
FROM [DBName].[UserName].[TableName]
') AS TableNameLink