You are an Audit Senior currently planning the 30 June 20X8 audit of Forest Limited, an Australian-owned company that produces and exports woodchips to Japan. Forest's operations are located in Eden, on the far south coast of NSW. Timber is purchased from forests nearby, processed into woodchips and immediately stockpiled for export at the company's shipyards at Twofold Bay. Forest contracts timber cutters to deliver set tonnages of logs to its mill throughout the year. Woodchips are transported to Japan on charter vessels, which make an average of one trip a month.

At a recent planning meeting with Forest Limited's senior staff, you obtained the following overview of this year's operations:

A massive conveyor belt is used to transport the woodchips from the mill to the stockpile. The manufacturer of this belt was recently taken over by an overseas competitor of Forest Limited, Chipper Limited, which processes woodchips in several South-East Asian countries. Chipper Limited has indicated that it is willing to sell equipment to its competitors, but at double the price it will sell to its other customers. It is doubtful whether any other companies in the world manufacture such specialised conveyor belts.

Based on current usage figures, it is expected that the existing conveyor belt will last until December 20X9. Sufficient spare parts are on hand to carry out routine maintenance work. However, should a replacement belt be required, it would take at least six months to have a replacement made and shipped to Australia, and a further four weeks to install and test it. It is unlikely that the company could survive a six-month interruption to normal operations. Management are currently deciding whether they should order a replacement belt from Chipper Limited despite the excessive cost, or continue to search for an alternate supplier.

(a) what is the key accounts from the information provided that are subjected to an increase in audit risk. Briefly explain what factors increase the audit risk associated with the accounts identified. In your explanation, please mention the key assertion(s) at risk of material misstatement and the components of the audit risk model affected for the account identified.