MUMBAI, Aug. 7 -- Three mechanics were injured when a ceiling slab and plaster collapsed inside a store room-cum-rest room at the Majas BEST bus depot on Thursday morning, renewing concerns over the condition of the city's ageing depot buildings after a similar incident at Shivaji Nagar earlier this week. The accident occurred around 6.45am in a facility used by M/s Mateshwari Urban Transport. The injured mechanics, Riyan Shaikh, 19, Salman Khan, 23 and Mujamuddin Khan, 20, were taken to Jogeshwari Trauma Care Hospital, where they received primary treatment before being discharged. These repeated incidents have revived demands for a structural audit of all BEST depots.Sources said BEST committee member Nitin Nandgaonkar had written to the administration on March 23, warning that several depot buildings were in a dilapidated condition and posed a threat to employees. BEST officials said the undertaking is in the process of overhauling its depot infrastructure. htc...