There is no such thing as a permanent Fix. Sooner or later either A: it will happen again or B: something else will fail.
NOTE: This statement also applies to replacing the cooling unit (Or the entire fridge) Sooner or later the new unit will also fail.. Unlelss it gets lucky and some nice semi driver totals the RV as happend to me (The new cooling unit did NOT fail..) (Note.. it really turned out to be a good thing as other thins were about to fail..but did not.. quite.. due to the insurance payment.. .I can't believe the issues I found during cleanout).