zx636 wiring loom

hey people firstly let me introduce myself, my names luke living on the sunshine coast and just bought myself an 06 zx636. Had the bike a week and a half now. Was riding the other day and it started running roughly and sputtering cutting out etc but idling fine. So was guessing some bad fuel, took it to the shop to be safe and they tell me a rat has chewed up the wiring, looks like i am going to have to replace the whole loom. Any idea on a typical price for this?cant believe my luck didnt think to unbolt the tank and check for rat damage when i bought it and was running fine for about 300ks i did on it in that week. Anyone had a similar problem?not happy