Info from http://smg.toyotapartsandservice.com/owners.php
Do a service history on the VIN at your local dealer they can tell what's been done to it before you purchased it. (but with 30000miles since you bought, the service they recommened is most likely required. "coolant")
2003 Corolla
60,000 Miles - 48 Months
Replace engine air filter

Replace engine coolant

Replace engine oil and oil filter

Rotate tires
Inspect the following:

Ball joints and dust covers

Brake lines and hoses

Brake linings/drums and brake pads/discs

Differential oil

Drive belts 4

Drive shaft boots

Engine valve clearance

Exhaust pipes and mountings

Fuel lines and connections, fuel tank band and fuel tank vapor vent system hoses

Fuel tank cap gasket

Radiator core and condenser

Steering gear box

Steering linkage and boots

Transmission fluid or oil.