Asset risk is a very broad in its coverage, so you have your work cut out for you. You might want to start with assessing at the very top level, meaning strategic risk and then as it is a production business, you can move to operations management and logistics risk. Here, you would want to look at all the risks in the supply chain, or the risk associated with each actor. These days, with the focus on the environment, you would want to look at environmental/ecological risk, compliance risk. There are of course finance related risk, which immediately suggest that you would want to look at the risks to your IT systems ( from hackers, for instance). The risks of fraud of all kind, pilferage should not be forgotten. Market/commercial and product risks also should figure. A wrong product introduced at (really a wrong time) and at the wrong price will lead to mounting inventory, and little sales, etc.
I am particularly interested in the intangible risk associated with people and their knowledge and experiences. How would you assess and quantify such intangible assets? There is more I can discuss but shall not do so for now. I end with citing this paper as I have an interest in Ops Mgmt and Supply Chain Mgmt; I did teach the subject for a number of years before I moved on to other interesting things:
Uta Jutter (2005): Supply chain risk management - Understanding the business requirements from a practitioner perspective. The International Journal of Logistics Management, 16, 1, 120-144.