What was found
AFTER TAKEOFF, MLG SELECTED UP, BOTH PRIMARY DISPLAY & SECONDARY SYNOPTIC DISPLAYED RED FOR LT MLG. RAN QRH & COORDINATED WITH GOC & MOCC FOR AIR TURN BACK. HANDLE DOWN, ALL PRIM DISPLAY & SEC SYNOPTIC DISPLAYED GREEN. SHORTLY SECONDARY SYNOPTIC DISPLAYED RED. LANDING UNEVENTFUL. EMERGENCY DECLARED. FOUND LT MLG UPPER LINK ASSY GUIDE BROKEN IAW CMM 32-10-02, ITEM 119. R & R LT MLG LINK GUIDE ASSY IAW AMM & CMM 32-10-02 ITEM 119. R &R CRANK ASSY ARM ON LT MLG IAW CMM: 32-34-03. INSTALLED PROXIMITY SENSOR ON LT MLG IAW AMM 32-61-15-4. OPS CHK GOOD. CLEARANCES WITHIN SPEC AMM 32-21-00-700-803, JACKED ACFT IAW MM 07-11-00-582-801. ACCOMP GEAR SWING IAW MM 32-31-00-700-803. GEAR SWING & ALL GEAR INDS GOOD.