We worked through the car item by item and found the following:
The rear brake discs and pads were worn and past the point where they should have been replaced. The disc surfaces showed scoring and the pad material was thin. We sourced Hyundai Genuine Parts for the replacement.
The spark plugs were original NGK units that had seen significant wear. The colour and condition of the old plugs showed they were due. We replaced all four with new NGK equivalents.
The coolant reservoir showed discoloured coolant. We topped it up with the correct specification.
The ATF was low. We topped it up to the correct level.
The throttle body had carbon buildup on the butterfly plate and bore, which is normal over time in Singapore's congested traffic. We cleaned it.
The cabin air filter was dirty and overdue for replacement. We swapped it out.
Wiper blades were inspected. The right wiper blade was confirmed as the incorrect size for this car and flagged to the owner for replacement.