v5r3 ftp and cpyfrmimpf and ccsid

Problem since moving to V5R3
I have a flat file that is received each week via ftp with a get xxx (replace
from a unix server. The file NACMNOC on the i5 has a single field, ccsid = 500. 
            CPYFRMIMPF FROMFILE(NACMNOC) TOFILE(NACM400) +      
                         MBROPT(*REPLACE) RCDDLM(*ALL) +        
                         DTAFMT(*DLM) STRDLM('"') FLDDLM(',') + 
                         RPLNULLVAL(*FLDDFT)        
File NACM400 fields are all ccsid = 37            
Everything is converting fine except 1 character. 
The from file has a a hex BB (looks like a right bracket).
After cpyfrmimpf that character becomes a hex 4F  (|). 
My pgm looks for the hex BB to separate parts of the data.
Worked fine on prev system at V4R5.
Anything I can do besides recode the rpg?
jim franz