Do not fall into the trap that new people come into ownership of a 'Ferrari' often assume, which is the expectation that a 15 years old car will be 'concours' in every area just because its mileage is low and/or the bodywork looks well polished.
I would first advise yourself to become very familiar with what is expected of the yearly services (as if you owned the car already). As others have commented regardless of mileage the yearly fluid changes *must* be adhered to.
> Brake fluid unchanged can turn to jelly in the system making it a pain to ever get consistent braking again without replacing brake lines, etc.
> Neglected fluid changes on the gearbox and engine can diminish life expectancy of the engine, regardless of mileage.
> Most of the bushes are probably well past their best by now and (ideally) should have been replaced.
Ofcourse the early cars had quite a few recalls and updated parts too. If these haven't been done (and where usually done if the car was serviced in an official main dealer within the first 3 years of life) then the outcome of these problems could bite you too.
Not many people go out and change all the parts necessary to make the car handle like new. For instance all the suspension bushes in the wishbones, all the anti roll bar bushes, all the engine and gearbox bushes. All these things are expensive and time consuming to replace but by 15 years on they are probably tired and saggy. Time alone causes rubber bushes to go off just like tires. All I am saying is be 'realistic' about what to expect.
Its certainly not a new car anymore and not everyone is as fastidious about such items. Ofcourse I would at the minimum expect to see evidence of;
> Regular servicing every year (regardless of mileage)
> Cambelt and tensioner bearing services
Within the service file by now you should have seen ;
> Clutch change (and part update) - which may not have happened due to the low mileage so potentially a problem waiting to happen on a '99
> All recall parts changed (you can check the status of this using the chassis number with a Ferrari main dealer)
> Tires changed.
> Suspension Geometry checked regular intervals
> All fluids changed regular intervals.
PS. The workshop manuals are a good place to start for looking at the expected service items, you can download the 360 Modena ones here; All Ferraris