I advise against laying the machine fully down flat on its back .. or front or sides. Residual water can run out around top of the tub and seep into areas it shouldn't such as the control panel. Better to lay it down onto a block of wood or a step-stool or some such supporting at the top so it's not all the way down flat.

F&P parts have been available for years from SearsPartsDirect.com, FisherPaykelParts.net, and FisherPaykelParts.com (the last two are not related to F&P) parent company).

Assuming the pump is not the source of the noise, noisy spin is typically related to the main drive shaft bearings and seal going bad. The bearings (and drive shaft) can be replaced but requires some special F&P-sourced setting tools to do properly. It's possible a competent/experienced mechanic DIYer can do the job without the special tools. I believe a replacement outer tub includes bearings but a drive shaft would also be needed. Whirlpool has a different tool for their machines based on F&P's design but I don't know if it works directly on F&P-branded machines.

Could also be worn suspension springs/rods ... but I assume the noise involved is not vibration from tub balance oscillations, and occurs if spin is run with no clothes.