B757-200 CREW HAD DAMAGE TO #2 ENG FAN BLADES THAT WAS DETECTED BY THE FLT ATTENDANTS.

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DURING CLBOUT FROM KFLL; A FLT ATTENDANT CALLED THE COCKPIT AND EXPRESSED CONCERN ABOUT A PRESSURIZATION LEAK-TYPE NOISE AT 2R DOOR. SHE SAID IT WAS 'UNUSUALLY LOUD' AT THAT LOCATION. A QUICK CHK OF PERTINENT INDICATIONS BY MY FO AND I REVEALED ALL INSTS WERE NORMAL; NO ENG VIBRATION OR ANY OTHER NOISE WAS DETECTED ON THE FLT DECK. WE WROTE UP A POSSIBLE 'PRESSURIZATION NOISE/LEAK AT 2R DOOR' IN THE MAINT LOGBOOK; SENT AN ACARS ADVISEMENT TO THE MAINT COORDINATOR; AND ADVISED TPA OPS/MAINT AS WELL OF THE POSSIBLE PRESSURE LEAK. ON THE GND IN KTPA DURING THE DEPLANING PROCESS; THE PURSER AND HER FLYING PARTNERS FURTHER EXPRESSED CONCERN REGARDING THE NOISE STATING 'IT COULD BE THE R ENG; IT JUST DOES NOT SOUND RIGHT.' I THOROUGHLY DISCUSSED THESE CONCERNS WITH THE PURSER AND OTHER FLT ATTENDANTS; AND THEN WENT OUTSIDE TO INSPECT THE R ENG. UPON CAREFUL INSPECTION OF THE ENG; IT WAS OBSERVED THERE WERE 6 FAN BLADES; SYMMETRICALLY SPACED (APPROX) 60 DEGS APART IN THE FAN ASSEMBLY; WITH THEIR TIPS 'BENT FORWARD.' THE NATURE OF THE DAMAGE WAS PERPLEXING DUE TO AN ASSUMPTION THAT IF WE HAD INGESTED A FOREIGN OBJECT; ONE WOULD EXPECT THE FAN BLADES TO BE BENT AFT. MAINT WAS ADVISED OF THE BLADE CONDITION; AND A LOGBOOK ENTRY WAS MADE. WHEN THE EXTERNAL AREA OF THE ACFT WAS PREFLTED IN KFLL; THE R ENG WAS STILL RUNNING; THEREFORE; A SECOND INSPECTION WAS MADE OF THE R ENG AFTER IT WAS SHUT DOWN. ALTHOUGH THE R ENG WAS STILL ROTATING DUE TO WIND; NO ABNORMAL FAN BLADE CONDITIONS WERE NOTED. FURTHER; THERE WAS NO ADVISEMENT BY GND CREW FOLLOWING THEIR EXTERIOR INSPECTION OF THE ACFT THAT THERE WAS ANYTHING WITH THE ACFT. IT IS UNCLR AS TO HOW A CREWMAN CAN PREFLT INSPECT AN ENG'S FAN BLADES WHILE THEY ARE SPINNING; BUT PERHAPS THAT IS SOMETHING THAT TECHNICIANS COULD LOOK AT AS AN OPERATIONAL CHALLENGE. AN INCREASED VIGILANCE BY ALL FLT CREW'S TO ENG ANTI-ICE RUN-UPS MAY ALSO BE APPROPRIATE.