The unlit propane torch method is safer and should help you localize the leak easier than starter fluid. This is the preferred method, for sure, since propane will disperse more quickly than starter fluid and if it does get lit a quick "whump" burns it all up with no damage other than some burned off body hair.
Having said that, if you have a pretty good idea where the leak is and just want to confirm, then starter fluid used in small quantities is OK.
Whichever you decide to use, be sure to wear eye protection!!!
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-- John
Slowly shopping for a 991 or 981...
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