1937 July
In a major overhaul during annual survey, Toroa refastened with new galvanised steel planking bolts, the originals having suffered severe corrosion from galvanic action with the copper sheathing. Copper replaced by zinc sheathing over tarred felt and schenam. Corroded 12-foot length at base of each fore-&-aft bulkhead either side of boiler & enclosing coal bunkers replaced by 12″ wide strip of 1/4″ plate let in and welded. Repairs to valves and engine.
