What was found
UPON MAIN CABIN DOOR CLOSURE FROM INSIDE OF AIRCRAFT COUNTER SPRING BROKE. CABIN DOOR IS CLOSED MANUALLY FROM OUTSIDE AND WILL FREE FALL OPEN WHEN UNLATCHED. GAINED ACCESS TO MED COUNTERBALANCE SPRING. COMPLETED GVI AND NOTED FWD SPRING IS BROKEN. REMOVED REEL ASSY, SHAFT STOP, RETAINER CLIP, ARBOR ASSY. DISASSEMBLED COUNTERBALANCE SPRING AND INSTALLED NJA SUPPLIED NEW SPRING, REINSTALLED REEL ASSY, SHAFT STOP, RETAINER CLIP, ARBOR ASSY. PERFORMED COUNTERBALANCE SYSTEM RIGGING PROCEDURE, ADJUSTED COUNTERBALANCE SPRING AND CABLE TO CORRECT TENSION. MED OPS CHECKED GOOD. NO FURTHER DISCREPANCIES NOTED. RESTORED ALL GAINED ACCESS TO ORIGINAL CONFIG. IAW AMM 52-10-50.