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In October 2010, the 20-by-17-metre (66 by 56 ft) central keel block manufactured by BAE for Hobart was found to be distorted and incompatible with other hull sections.[32] The cause of the fabrication errors is unknown: BAE blamed incorrect drawings from designer Navantia, while the AWD Alliance claimed the other two shipyards have not experienced similar problems, when in fact they had,[33][34][35] and suggested first-of-kind manufacturing errors were made by BAE.[32][36] However, a report in 2014, by the Australian National Audit Office (ANAO) confirmed that 'errors resulting from a sub-standard technology transfer procedure (passing on specific techniques relative to the design) & drawings that were not localised by designer Navantia' were to blame.[37] The delay in reworking the keel block was predicted to set construction back by at least six months.[32] Other major issues during Hobart's construction included the need to replace 25% of the internal pipework due to faulty manufacture, and the initial rejection of the ship's mainmast block because of defects in the cabling and combat system equipment.[33][34] Brisbane's construction has been marred by numerous defects requiring rework.[34]