If you are in the Klang Valley, there are a few shops which are able to repair/recondition/replace the HV batteries.
For the Toyota, it is possible to replace certain cells.
For single or small number of cells which need to be replaced, they can replace those cells and perform a balancing and you are good to go.
If more cells needs to be replaced, they'll sell you a reconditioned module.
There are plenty of resources online if you are interested in the battery.

Other components such as inverter, compressor, brake pump, etc, you can get more information from owners groups.

However, if your drive involves lots of full charge-discharge cycle, such as hill climb and decent, the battery may get more stressed and fail earlier.
Example, daily up and down Genting.
However, usually when it fails, it is not all the cells in the module

Check the mileage of the cars as the hybrids tend to have higher than average mileage due to the nature of the usage