What to Do After One Ruptured Saline Breast Implant?

It is extremely important that rupturing an implant be done in a sterile fashion by a plastic surgeon with experience in breast augmentation. Failure to do this can result in infection.

Although the cost of puncturing an implant to deflate it would be minimal the best and safest medical advise is to Remove ruptured saline breast implants

Although it is possible to leave ruptured saline implants in your body it is not recommended by most plastic surgeons. Once there is a leak in the implant, then serum can also enter it which is a potential site for infection. In general leaving a foreign body without providing a purpose doesn't make a lot of sense. Removing implants is straight forward and can even be done in the office under local anesthesia to minimize costs if this is what is preventing you from considering this recommendation

You should have a professional manage a controlled deflation of the implant. Believe it or not, I actually performed 5 needle perforations of an implant in an effort to slowly decrease a breast prior to downsizing implants and despite using a 16G needle, it did not deflate.

Your saline implant should be covered under the manufacturer's warranty so you would get  new one free. There is no reason to deflate the other implant. Although the deflation is a harmless event, deflated implants can have folds and bumps that could be uncomfortable, so replacement is a better option.