After today's maintenance, the reflection from the locked IMC onto the IMC refl PD is 2.5 times higher.

IMC REFL DC Power in mW
Input Power     Last Night      Today
----------------------------------------
2 W             0.07 mW         0.17 mW         
22 W            0.7 mW          1.8 mW

Not sure what could have caused this, could be laser work.