What was found
AFTER ROTATION WITH A POSITIVE RATE, MLG RAISED & A MASTER WARNING FOR MLG LEVER DISAGREE CAME ON ALONG WITH A MASTER CAUTION FOR INBOARD BRAKE INOP. NOSE AND LT MLG INDS WHITE AND RT MLG IND RED. ASKED FOR VECTORS TO MXE VOR & HOLDING IN ORDER TO ASSESS SITUATION & RUN APPROPRIATE CHECKLISTS. FOLLOWING QRH FOR MLG LVR DISAGREE, CYCLED MLG HANDLE DOWN & ALL 3 GEAR IND WENT TO DOWN & GREEN. CONSIDERING ALL FACTORS, DECIDED TO LEAVE MLG DOWN & RETURN TO PHL AFTER RUNNING ALL NECESSARY CHECK LISTS. DECLARED AN EMERGENCY. LANDED UNEVENTFULLY AND TAXIED BACK TO GATE. MX FOUND 2 BAD PROX SENSORS ON NLG AND ON LT MLG UPLOCK BOX. INSTALLED 2 SERVICEABLE SENSORS IAW EMB 145 MM 32-63-02 AND 32-61-01.