(3) there was violation by the people's court of the legal procedure which may have affected the correctness of the judgment or written order;
"or (4) the judicial officers have committed embezzlement, accepted bribes, done malpractice for personal benefits and perverted the law in the trial of the case.
"If a local people's procuratorate at any level finds that a legally effective judgment or written order made by a people's court at the corresponding level involves any of the circumstances specified above, it shall refer the matter to the people's procuratorate at a higher level with the request that a protest be lodged by the latter in accordance with the procedure for trial supervision."
Article 186 Cases in which protest was made by the people's procuratorate shall be retried by the people's court.
"Article 187 When a people's procuratorate decides to lodge a protest against a judgment or written order made by a people's court, it shall make the protest in writing."