Dometic cooling capacity has decreased

[WesternHorizon]

1995 Class C with a RM2611

I bought it 5 years ago and the fridge has always worked well, but it did struggle last summer in 100 outside and 90 inside temps.

In the past few months I have used the RV very heavily. It seems like the cooling capacity has gone down.

Right now it is 88 outside and 85 inside, the fridge is on setting 5/5 (coldest), and it is holding just barely at 39F. Freezer is -6F. On propane.

It recovers overnight in 45F ambient temps, going down to maybe 32F with same setting.

AC power is a bit better but not much.

Wondering if the R717 (ammonia) could be a bit low? I very much doubt it has ever been touched in 24 years.

Thanks for any suggestions.

[WesternHorizon]

Never I would guess

[Lwiddis]

Old age...23 years of service + at least 5 years of no maintenance. Hmmmm

[enblethen]

When was the last time the stack was cleaned?
When was the last time the burner was cleaned?