An air carrier crew reported striking a bird with the left engine on approach to SJU Runway 10. The crew did not see the bird; feel its impact; or see signs of engine damage before reaching the gate.

Narrative

There were some minor deviations for thunderstorms approximately 50 NM northwest of SJU (remnants of a Hurricane). Ceilings were around 10;000 FT with scattered rain showers between DDP NDB and SJU. The ILS 10 approach and landing were normal (First Officer was pilot flying). The runway was in sight approximately 20 NM out (VMC). Taxi-in and shutdown were normal/SOP. After we exited the cockpit about to leave the aircraft one of the ground crew from SJU indicated there was apparently some bird strike damage to one of the engines. As I entered the jet bridge; the oncoming First Officer had completed his walk-around and said the same; adding that the number 1 engine compressor blades also had damage. I decided to examine the left engine myself and walked down to the ramp. One of the first stage compressor blades was indeed significantly bent; two other adjacent blades seemed to be slightly bent. There was also blood and feathers lining the interior acoustic wall of the engine intake. I returned to the jet bridge; debriefed my Captain; and we agreed to follow-up with a ACARS and a call to Maintenance. I then sent the ACARS and talked to Maintenance via commercial radio. In the meantime the station was made aware of the problem and Contract Maintenance was called.