I tested the status of several EOMs by injecting them with the CW OEWaves laser. Its power is of 15.37mW. 

With the viewer one can see where losses are located. For 3 of them, there is no power at output (nW).

for S/N 11419-12 and 10305-09 some losses are visible at the splicing point (IN side) of the EOM metallic case. 

for S/N 12487-02 some losses are visible at the input connector of the fibre. Maybe soldering a new connector may fix the issue. To be tested.

for S/N 2559-22, 6mW are observed at output. Slightly more losses than the design but may not prevent regular operation with it.