NSClient++ Help (#1) - NSCA agent sends only OK (0) and UNKNOWN (3) return_codes (#93) - Message List

While testing NSCA agent (night build Win32-20080220-2106). It seems that NSCA agent sends only OK(0) and UNKNOWN(3) return_code. Tested using various commands. Here is a sample from nagios log; in the following sample the return code should be 2(CRITICAL) instead of 3(UNKNOWN):

[02-21-2008 16:52:50] SERVICE ALERT: P02NP1812;Services;UNKNOWN;SOFT;1;CRITICAL: WinDefend?: stopped (critical) [02-21-2008 16:52:50] PASSIVE SERVICE CHECK: P02NP1812;Services;3;CRITICAL: WinDefend?: stopped (critical) [02-21-2008 16:52:50] PASSIVE SERVICE CHECK: P02NP1812;Memory;0;OK: physical memory: 1.52G