Took my Yamaha F225 4 stroke to a Yamaha dealer to troubleshoot/repair sluggish, wot 4800 max, hard getting out of the hole. Pretty sure wot should be 55-6000. They ran fuel pressure test, checked spark and compression, fuel is okay. They found fuel in the oil say they are pretty sure bypassing through the injectors. Recommend injector cleaning $475 in addition to the $275 so far in tests. Is this a reasonable cost?