A B757 FO RPTED THAT THE FAA NOTICED HER COMPANY OF AN INVESTIGATION THEY ARE MAKING INTO A FLT ON WHICH SHE WAS THE FO.

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I HAVE BEEN NOTIFIED BY MY COMPANY THAT THE FAA HAS ISSUED A LETTER OF INVESTIGATION FOR A FLT DURING WHICH I WAS THE FO. IT HAS BEEN SEVERAL DAYS AND NUMEROUS FLT HRS SINCE THAT FLT. PLT GROUP LEGAL HAS INFORMED ME THAT THE EVENT WAS RELATED TO 'A TURN NEAR PLYMOUTH; IN;' BUT WITHOUT ANY MORE SPECIFICS FROM THE FAA; I'M LED TO SPECULATE ABOUT WHICH 'TURN' IS IN QUESTION. THERE WAS A POINT ON THE KOKOMO ARR WHEN THE ATC CTLR DIRECTED US TO TURN APPROX 50 DEGS L; THEN SAID SOMETHING LIKE 'FOR TFC; TURN AN ADDITIONAL 20 DEGS L AND TIGHTEN UP THE TURN.' I ACKNOWLEDGED THE ADDITIONAL 20 DEGS L AND STATED THAT WE WERE DOING THE BEST WE COULD; AS WE WERE IN A 30 DEG BANK TURN. ALL ATC INSTRUCTIONS RECEIVED DURING THE ARR WERE ACKNOWLEDGED AND COMPLIED WITH IMMEDIATELY UPON RECEIPT; AND AT NO TIME DID ATC QUERY; CLARIFY; OR OTHERWISE QUESTION ANY ACTIVITY/MANEUVER THAT OCCURRED. RECEIVING A NOTICE OF INVESTIGATION DAYS AFTER A FLT MAKES IT VIRTUALLY IMPOSSIBLE FOR A PLT TO ACCURATELY RECALL SPECIFIC DETAILS. AS A PROFESSIONAL PLT; I FLY NUMEROUS LEGS EVERY DAY -- MANY WITH THE SAME ROUTINES. THEREFORE; IT IS VERY DIFFICULT TO RECALL THE SPECIFICS OF AN UNEVENTFUL FLT THAT HAPPENED DAYS EARLIER. I STRONGLY URGE THAT THE FAA BE REQUIRED TO INFORM PLTS IMMEDIATELY OF ANY INTENDED ACTIONS.