Vessel engine had overheated then had water in the bilge. Managed to get the engine started before CG arrive and was being assisted on scene by Sea Patrol. Vessel skipper advised they could run on own power so we shadowed them back to Mana where they proceeded to their berth. No tow was required.
Links:
[1] http://coastguardmana.org.nz/users/neil-cornwell
[2] http://coastguardmana.org.nz/users/trevor-farmer
[3] http://coastguardmana.org.nz/crv/crv-trust-porirua-rescue