Updated at 7:35 a.m. ET June 22, 2013 (CBS News) PRETORIA, South Africa - One of Nelson Mandela's grandsons said Friday he expects Mandela to be discharged from the hospital soon. On Saturday, a spokesman for South African President Jacob Zuma released a statement saying that Mandela's condition remains serious but stable. South African government's response to CBS News Nelson Mandela hopefully coming home soon, grandson says Nelson Mandela's health: Is it time to let go? The statement that Zuma's spokesman released Saturday said that it was decided that transferring Mandela to the second military ambulance was the best course of action. "The fully equipped military ICU ambulance transporting former president Nelson Mandela on 8 June 2013 had a full complement of specialist medical staff including intensive care specialists and ICU nurses," said the spokesman, Mac Maharaj. The convoy included two quick response vehicles. When the ambulance experienced engine problems it was decided that it would be best to transfer to another military ambulance which itself was accompanied for the rest of the journey by a civilian ambulance. All care was taken to ensure that former president Mandela's medical condition was not compromised by the unforeseen incident. The doctors attending are satisfied that the former president suffered no harm during this period. However, cardiologists we spoke to said any delay - especially for a man that old - is cause for serious concern and, while it is difficult to assess, could have had an impact on Mandela's condition.