CPA403D on Lexlink (MarkNet external) attached Lexmark 2481

[Neil Palmer/DPS <neilp@xxxxxxxxxxx>]

Have a customer who has several Lexmark/IBM 2381 printers LAN attached 
(Ethernet) via external Lexmark MarkNet Pro print servers, using Lexlink 
protocol.  They recently replaced one of the old 2381's with a new Lexmark 
2481.  Now every 10 pages or so (probably when the buffer on the 2481 
fills) they get a message CPA403D (Operator Action required on device 
PRT05).  They have to respond with 'R' to continue printing.  I'm 
reluctant to use the System Reply List to respond 'R' to CPA403D from this 
printer as I think it could cause a loop if there really is a problem 
(printer not ready, out of paper, etc.).  The device description has 
PRTERRMSG(*INFO) specified.  There was never a problem with the 2381 
printers.  The system is at V5R2 with latest cumulative PTF package 
(C4244520).  Any ideas?  Wondering if it could be a hardware problem with 
the new 2481.

...Neil