Radio New Zealand International carries the following announcement on its website: On Sunday 19 October we will be off-air between 1000-1600 NZDT (2100-0300 UTC Sat) This is to allow engineers to make adjustments to the antenna system.
From 19-25 October there are also some frequency changes:
2051-2235 UTC on 17675 AM & 15720 DRM
2236-0458 UTC on 15720 AM & 17675 DRM
(Source: Radio New Zealand International website/R Netherlands Media Network Weblog)