FRSDiag.exe

Windows 2003 Server SP2, 5 sites, 2 DC's at HQ, one DC at each remote site.
I ran FRSDiag.exe and everything passed except for these 4 errors. We have 5
sites, the main HQ and 4 remote sites. The 4 errors were identical except for
the 4-digit number. The numbers were 2766, 2747, 2763, and 2757. Each message
said: ERROR: File Backlog TO server "DOMAIN\SERVER$" is: 2766 :: Unless this
is due to your schedule, this is a problem! The remaining 3 errors were
exactly the same except for the numbers noted above, and the server names
which were in each respective site. My question is, how to I begin to
interpret these errors, so that I can troubleshoot and attempt to correct the
problem.
Thanks in advance!
Sam (Flux)