I couldn't find the manual for the 2005, the 2006 says the automatic transmission should be inspected every 24,000 km (15,000 mi) and changed every 60,000 km (37,500 mi).
The manual transmission should be inspected every 48,000 km (30,000 mi) and has no recommended change within 180,000 km (112,500 mi) where the maintenance schedule ends.
Here is the owners manual for the 2006, the maintenance schedule is section 6 almost the very end. 2006 Suzuki Forenza Owner Manual
You should purchase the factory repair manual. With current dealership repair rates at 90 to 120 dollars per hour, It should pay for itself the first time you use it.
If you want a cheaper manual, Chilton's is good if you are technically proficient, and Hayne's is better if you aren't. Both can be purchased at Auto-Zone, NAPA, etc,
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