E145 CREW HAD AN EICAS WARNING OF A PNEUMATIC BLEED LEAK. THIS RESULTED IN THE ACFT RETURNING TO THE DEP STATION.

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HE WAITED ON THE GND FOR APPROX 1 HR DUE TO A GND STOP IN ORD. IT WAS A NORMAL TKOF AND CLBOUT WITH CLRNC TO 10000 FT AND HDOF TO ZOB. AT 10000 FT; WE WERE INSTRUCTED THAT IT WOULD BE A FEW MINS BEFORE WE GOT HIGHER. AT THIS POINT; THE ANTI-ICE SYS CAME ON LINE AS NORMAL. ABOUT A MIN AFTER; THE ICE PROTECTION WAS ON LINE. WE RECEIVED A BLEED LEAK 1 MESSAGE ON THE EICAS. AS THE PF; I CALLED FOR THE EMER PROC CHKLIST. THE CAPT RAN THE CHKLIST AND GOT CLRNC TO DSND OUT OF ICING CONDITIONS. THE BLEED LEAK WAS ISOLATED AS PER THE EMER PROC CHKLIST AND AOM. WE GOT A 'DSND TO' MESSAGE ON THE EICAS. THE CAPT GOT CLRNC TO 3000 FT TO GET OUT OF ICING CONDITIONS. ONCE THE BLEED LEAK PROB WAS FIXED; AND WE DECIDED TO HEAD BACK TO SYR; WE REALIZED THAT WE WERE OVERWT; AND THE CAPT DECIDED TO GET IN TOUCH WITH DISPATCH AND MAINT OPS CTLR TO DISCUSS THE MATTER. WE WERE ADVISED BY MAINT OPS CTLR THAT THEIR PROCS FOR THIS SIT CALLED FOR A LNDG WITH A DSCNT RATE OF 300 FPM. WE CHKED THE AOM AND FAMILIARIZED OURSELVES WITH THE MENTIONED PROC. WE PRESENTED MAINT OPS CTLR AND DISPATCH WITH THE IDEA OF MERELY FLYING FOR AN HR SO WE COULD BURN THE FUEL OFF. THEY SAID AS LONG AS WE COULD COMPLY WITH THE PROC; THERE WOULD NOT BE ANY NEED TO DO SO. WE WERE VERY CONFIDENT THAT COMPLYING WITH THE PROC WOULD NOT BE A PROB. THE CAPT BRIEFED THE PAX ON THE SIT. WE AGAIN CHKED OUR PERFORMANCE MANUALS AND SAW WE HAD PLENTY OF RWY AT OUR WT. WE SET UP FOR A LONG FINAL AND ALSO REQUESTED EMER EQUIP. WE TOUCHED DOWN AT 43900 LBS; AT A DSCNT RATE OF 300 FPM OR LESS. IT WAS A VERY SOFT TOUCHDOWN WITH THRUST REDUCTION ONLY AFTER TOUCHDOWN AS INSTRUCTED BY AOM