They are generally printed in every manual. Here is the warranty from James Bond 007 (60th LE)
"STERN PINBALL INC LIMITED WARRANTY
Stern Pinball Inc (‘SELLER’) warrants only to the initial purchaser of its
products that the items listed below are free from defects in material
and workmanship under normal use and service for the warranty period
specified:
• Printed circuit boards (game logic): 2 months
• Dot Matrix / LCD Display: 9 months
No other parts of seller’s product are warranted.
Warranty periods are effective from the initial date of shipment from
seller to its authorized distributors.
Seller’s sole liability shall be, at its option, to repair or replace products
which are returned to seller during the warranty periods specified,
provided:
1. Seller is notified promptly upon discovery by purchaser that
stated products are defective.
2. Such products are properly packaged and then returned
freight prepaid, to seller’s plant."
It's near the back, right before the licensing agreement that says you can't modify the software on your own machine and if you do they can brick it if they feel like it.