CRJ200 FLT CREW RECEIVES 'COMP MON' EFIS MESSAGE ON DEPARTURE; AFTER CONSULTING MAINTENANCE AND EXPERIENCING SUBSEQUENT RELATED ISSUES; FLT CREW ACCOMPLISHED UNEVENTFUL DIVERSION. MAINTENANCE FOUND A PIECE OF CARBON IN CAPT PITOT TUBE.

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AFTER DEPARTING AN 'EFIS COMP MON MSG' WAS DISPLAYED ON ED1. SIMULTANEOUSLY ON PFD #1; #2 IAS (AMBER) MESSAGES APPEARED. THE QRH WAS COMPLIED WITH AND A CALL TO MAINT WAS MADE. WE AGREED WITH MAINT THAT THE FLT COULD BE CONTINUED. LATER AT CRUISE ALT (FL360) SMALL PITCH MOVEMENTS WERE FELT IN THE YOKE. THE AUTOPLT DISENGAGED AND AN ATTEMPT TO REENGAGE THE AUTOPLT WAS ATTEMPTED. MOMENTS LATER THE FO PFD BEGAN TO SHOW EXTREME PITCH AND BANK INDICATIONS. WE XFERRED CTLS AND I ASKED THE FO TO REQUEST A LOWER ALT. DUE TO MULTIPLE INDICATION FAILURES ON PFD #1 AND #2 I CHOSE TO DECLARE AN EMER AND DIVERT. A CALL TO DISPATCH WAS MADE AND THE DIVERSION WAS SAFELY COMPLETED. MAINT WAS PERFORMED AND WE CONTINUED. SUPPLEMENTAL INFO FROM ACN 805279: PASSING THROUGH THE LOW FLT LEVELS WE THEN GOT A MACH TRIM CAUTION; AGAIN WE RAN THE QRH AND CONTACTED MAINT. MAINT ADVISED US THAT IT WAS A RELATED ISSUE AND WAS TO BE EXPECTED WITH THE PREVIOUS PROB. AFTER A BRIEF DISCUSSION WE DECIDED TO DSND TO A LOWER ALT AND THE CAPT REQUESTED; AND WAS GIVEN FL240. I CONTINUED TO HAND FLY THE ACFT THROUGH THE DSCNT; THEN AROUND FL300 MY PFD STARTED TO FLICKER ON THEN OFF. AROUND FL270 MY ATTITUDE INDICATOR PITCHED UP ABOUT 20 DEGS AND BEGAN TO ROLL OVER 90 DEGS; AT THAT TIME WE STARTED TO GET THE BANK ANGLE CALL. WE ENCOUNTERED NO PROB THROUGH THE APCH AND LNDG. MAINT DID FIND A PIECE OF CARBON IN THE CAPT'S PITOT TUBE.