Are you on the Kapiti Coast? If so your channels have just been restacked.
http://www.rsm.govt.nz/cms/policy-an...el-information
A rescan should find the new frequency, assuming there isn't something interfering on that frequency eg an old VCR RF output if you have it looped through. 70% signal is a bit low actually. It's quite possible that the TVNZ signal is too weak, and the lower frequency it is now broadcast on is not as optimal for your antenna / signal path.
Do you have a decent UHF antenna?
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