Thanks for the feedback!
I used some links of Youtube to remove the boot trim and wiper motor. You can see how rusted the motor is, which was leaking down on the inside of the bottom boot trim. I'm pretty sure the water is getting in around the wiper arm/seal.
I will order a new motor unit, but not 100% on the seal. I could order a new seal or use some silicon sealant to make a better seal on the old one. Any suggestions appreciated.
Best!