Engine tuning is only required if car is giving starting trouble, idling problems, missing or jerking or consuming more fuel. Just get plugs cleaned and brake service at every 10,000 kms.
However, change fluids and filters when they ask because it's good for engine, transmission.
I only changed fornt disc pads (just for the heck of it) after 80,000 kms. Rear disc pads were good even after 134,000 kms. Changed just the drive belt after 100,000 kms (just for the heck of it) it could run another 20,000 kms, but did it as preventive measure.
The hoses were still strong after 10 years, not a single pipe changed or it gave away.
Replaced the stock coolant after 100,000 kms and seven years (just for the heck of it). It was mentioned in on engine bay sticker coolant to be replaced at 167,000 kms.
So see Corolla is basically a workhorse and build to last.
On periodic visits, just ask them to inspect things and carefully see what parts really need to be replaced.