A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH KNOWN #2 ENG VIBRATIONS AND POSSIBLE ENG STALLS BUT NOT RPTED IN THE LOGBOOK.

Narrative

I WAS SCHEDULED TO TAKE ACFT XYZ FROM ZZZ TO EWR ON FLT ABC. THE ACFT ARRIVED FROM ZZZ OVER 1 HR LATE DUE TO AN OVERNIGHT DIVERT TO DEN. ON APCH TO ZZZ THE NIGHT PRIOR; THE ACFT EXPERIENCED ICING. THE FO FROM THAT FLT THOUGHT THEY EXPERIENCED #2 ENG COMPRESSOR STALLS. AFTER EXAMINING THE LOG AND NOTING NO ITEMS ENTERED; I SOUGHT OUT THE CAPT AT OPS FOR A BRIEFING. HE CONFIRMED THAT THEY EXPERIENCED AN ENG VIBRATION ON FINAL THE NIGHT BEFORE; WHICH IS NORMAL UNDER ICING CONDITIONS. HE STATED THAT THERE WAS NOTHING TO RPT IN THE LOG WHEN THEY ARRIVED IN DEN. WHILE DEICING AT ZZZ; I CONTACTED MAINT TECHNICIAN AND INQUIRED AS TO THE PROPER PROC FOR CLRING AN ENG WHICH EXPERIENCED VIBRATIONS AS RPTED TO ME BY THE CAPT. MAINT ASKED ME IF I COULD SEE DAYLIGHT THROUGH THE ENG. I SAID A VISUAL INSPECTION WAS NORMAL. MAINT OFFERED NO FURTHER GUIDANCE. WE DEPARTED RWY 7 UNEVENTFULLY. ENRTE TO EWR; A FLT ATTENDANT WHO WORKED THE FLT INTO ZZZ RELAYED TO ME HER POINT OF VIEW. SHE SAID THE VIBRATION WAS SEVERE AND IT WAS ASSOCIATED WITH 3 LOUD BANGS. SHE SAID SHE HAD NEVER FELT AN AIRPLANE SHAKE LIKE THAT AND CONSIDERED HERSELF LUCKY TO BE ALIVE. WHEN THEY LANDED IN DEN SHE STATED THAT DEN STATION PERSONNEL REMOVED LARGE CHUNKS OF ICE FROM THE #2 ENG. SHE ASKED THE CAPT THE NEXT MORNING IF MAINT HAD LOOKED AT THE ENG. THE CAPT REPLIED AFFIRMATIVE. WITH THAT ENRTE REVELATION; I CONTACTED MAINT TECHNICIAN THROUGH DISPATCH AND REQUESTED THEY CONFIRM THE ICE INCIDENT IN DEN. MAINT GOT BACK IN TOUCH WITH ME 30 MINS LATER AND CONFIRMED HER STORY. MAINT STATED THAT MAINT IN EWR WOULD INSPECT THE #2 ENG UPON ARR. AT EWR; I CONTACTED MAINT FOR THE THIRD TIME TO ENSURE THE PROPER ENTRIES WERE RECORDED INTO THE LOG. MY CONCERNS WERE FOR THE LEGAL IMPLICATIONS FOR MAINT; PREVIOUS CAPT AND MYSELF. IN CONCLUSION; I FEEL THAT PREVIOUS CAPT SHOULD HAVE HAD THE ENG INSPECTED IN DEN AND COULD HAVE BEEN MORE THOROUGH WITH ME IN OUR BRIEFING.