Are Rubbing "Squeaky" Noises 3 Weeks Post op Normal?

When a patient experiences sounds from the breasts, often it is
early in the recovery period from breast augmentation surgery.  This is normal and is a reflection of some of
the irrigation fluid that has remained in the breast pocket.  Over a short time this irrigation fluid
becomes absorbed, and the sounds go away. 
Your situation is different in that the timing is 13 months post-op.   Fluid in the breast pocket is still likely
the reason for these sounds. However, newly accumulated fluid in a breast
pocket over a year after surgery is called a delayed seroma and should be
investigated.  A breast ultrasound can
confirm the diagnosis of seroma.  Delayed
seromas are associated in the majority of cases with having textured gel
implants.  Delayed seromas can also be
associated with a rare implant-associated cancer called anaplastic large cell
lymphoma.  I would suggest following-up
with your original plastic surgeon so that he/she can evaluate you for these
new symptoms.

The sounds may be caused by the development of a capsule around the
implant, or even a rupture in the worst case. 
I would encourage you to schedule an appointment with your surgeon
immediately to determine the source of the sounds.