MacBook Pro SMC Firmware Update 1.3
This SMC Firmware update adjusts the fan behavior in MacBook Pro systems (15-inch and 17-inch) when running under high workload conditions.
The updater application will be installed in the /Applications/Utilities folder and will launch automatically. Please follow the instructions in the updater application to complete the update process.
For more information, see this article: About the SMC Firmware Updates.
For additional information, please visit: OS X Mountain Lion: Firmware updates may keep reappearing in the Mac App Store.