Yes, you can upgrade your current left side PRECISION 3/3+ powermeter to PRECISION 3+ PRO (dual) by sending us your right side crank for Factory Installation.
Right-Side PRECISION 3+ Powermeter - Factory Install (Dual Upgrade)
IMPORTANT NOTE: If you currently have a PRECISION 3 (not enabled with Apple Find My) left side powermeter, you are required to include it with your right side crank for installation. The left side PRECISION 3 needs to be upgraded to PRECISION 3+ to ensure compatibility with the right side PRECISION 3+ powermeter.
How Do I Know if My PRECISION 3 has Find My?
If you already have a PRECISION 3+ as identified in the above article, you are not required to include it with your right side crank for upgrade.