So what damage did the turnround engineer miss, despite it being "evident" ?
The damage the report refers to, but to save you the trouble of actually reading what it says here it is:
'During the repeat Phase I Inspection at London Gatwick signs off fuselage skin damage were noted, just aft of the wing (stations1480 to 2181), with substantial areas of 'quilting' and 'rippling'of the skin panels.'