Apple has reportedly started a Quality Program to address the staining issues affecting the Retina display of its MacBook Pro laptops.

According to sources, the Cupertino-based tech giant will offer a free screen repair and replacement to users affected by the issue.

As first reported by MacRumors, Apple has no plans to announce details of its Quality Program to the public. Instead, it sent an internal memo regarding the issue and will most likely contact owners of MacBook and MacBook Pro models.

The site reported that the problem first emerged in March of this year after several users starting posting pictures of their laptops with damaged screen coatings.

Based on the images, the stain splotches and streaks appear across the laptop's display. According to Apple Insider, the staining appears in areas that are often in contact with fingers.

The exact cause of the problem is still unconfirmed but as the site noted, it may have been caused by over cleaning, high humidity or a mistake in the application if the screen's coating. It is also not yet clear how many users have been affected by the problem but a petition on Change.org that was launched to address the issue dubbed as "staingate" already reached over 4,700 supporters.

"I, on behalf of the thousands of other Apple customers who have purchased a MacBook Pro with Retina Display would like to you to be informed on the fact that there is a huge issue going around with the displays of our devices," petition author Cody Yuwapun wrote in a letter addressed to Apple chief Tim Cook.

"The issue is referred to on the Internet as 'staingate,' and much like 'bendgate' we would like you to take immediate action to help us fix our devices," he added. "We paid for premium quality Apple products, but instead received ones with huge defects."

Although Apple has not yet released a public statement regarding the problem, the company is reportedly working on a way to fix it. According to various sources, the Quality Program will offer free repair and replacement services to affected MacBook units that are less than three years old, or within one year after October 16, 2015.

Those who are eligible can take their laptops to an Apple Store, Genius Bar or any authorized Apple service center. On the other hand, for users who had their laptops' screens fixed out of warranty, they may contact Apple regarding a possible refund.