A police sergeant who coerced a subordinate into giving him money and brandy in exchange for favourable performance reports was convicted on 13 corruption charges yesterday. Defence lawyer Kevin Egan said Sergeant Tong Tsan-sing's case was a 'catastrophic personal tragedy'. Tong, 52, had planned to retire soon after 30 years in the force, Mr Egan told South Kowloon Court. The sergeant was found guilty of four charges of soliciting advantages and nine counts of accepting a total of $36,600 from Senior Constable Mang Hing-tai. He had denied the allegations and a further 13 alternative charges. The court heard Tong had solicited $135,000 and a dozen bottles of brandy worth $120,000 from the constable, who gave evidence under immunity. Between July 1994 and February last year, Tong received $30,000 in cash. The constable also helped him pay his phone bills for six months, totalling $6,600. Magistrate Michael Holmes said he was also concerned about the defendant, but said Tong had been wrong in squeezing a subordinate for advantages. He remanded the sergeant in custody, and adjourned the case to July 10 pending four reports on Tong's background. The court heard Constable Mang, 50, had retired in August 1992 but was re-employed on contract and had worked under Tong. As a result of the unusually favourable reports, Constable Mang secured a renewal of his contract early last year.