Apple sometimes have repair programs for different products. Meaning they repair your product free of charge if it is covered.
Update 2020: Here is a link, where Apple lists all available repair programs. Exchange and Repair Extension Programs
Here are some of the current repair programs available: Click the links below to get to Apples site directly for detailed instructions. The text on this page is only an excerpt, make sure to head over to the Apple site to get the entire overview of the apple repair program you are interested in.
Quality Program for MacBook Pro Anti-Reflective Coating
This program doesnt have any official page. If your 15 – Inch Retina MacBook Pro have issues with the coating on the display make sure to contact Apple and they in some cases will replace the display free of charge.
- 15-inch and 17-inch MacBook Pro models manufactured in 2011
- 15-inch MacBook Pro with Retina models manufactured from Mid 2012 to Early 2013
Apple has determined that a very small number of 3TB hard drives used in 27-inch iMac systems, may fail under certain conditions. These systems were sold between December 2012 and September 2013.
Apple has determined that, in a small percentage of iPhone 6 Plus devices, the iSight camera has a component that may fail causing your photos to look blurry. The affected units fall into a limited serial number range and were sold primarily between September 2014 and January 2015.
If your iPhone 6 Plus is producing blurry photos and falls into the eligible serial number range, Apple will replace your device’s iSight camera, free of charge.
Apple has determined that the sleep/wake button mechanism on a small percentage of iPhone 5 models may stop working or work intermittently. iPhone 5 models manufactured through March 2013 may be affected by this issue.
Apple will replace the sleep/wake button mechanism, free of charge, on iPhone 5 models that exhibit this issue and have a qualifying serial number.
Apple has determined that a very small percentage of iPhone 5 devices may suddenly experience shorter battery life or need to be charged more frequently. The affected iPhone 5 devices were sold between September 2012 and January 2013 and fall within a limited serial number range.
If your iPhone 5 is experiencing these symptoms and meets the eligibility requirements noted below, Apple will replace your iPhone 5 battery, free of charge.
There you go, hope this helps.