As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C IS IN FOR LETTER CHECK, OPNS 52148 & 68115 BOTH PERTAINING TO INSPECTION AND OPERATION OF PASSENGER AND EMERGENCY DOORS. FOUND R4 DOOR WOULD NOT OPEN COMPLETELY. NON-ROUTINE CARD 160 WAS INITIATED. FURTHER EVALUATION FOUND FAILURE OF THE COUNTERBALANCE TO BE THE CAUSE. REPLACED SAME.