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Hopefully i can help..
If the timing chain has broken - then in most cases it will most likly cause internal damage depending how it went ie: from startup or during normal/motorway driving conditions -obviously they will need to check for obvious damage the same if a timing belt had gone ie: bent valves but also damaged sprockets,keyways or any damaging effect to pistons/connecting rods - its can be quite unusual for a chain to suddenl;y go if this is waht has happened - always when a chain is going there will always be somesort of running issue or noise from the timing cover - many reasons for a failing chain or a chain wearing out prematurely is due to resulting poor maintenance chains usually should last the life of a car or engine or upto 200k when its usually advised to replace the chain/guides/sprockets etc..