Lots of nice Winnie owners on the
irv2.com Winnebago forum.
There is a bearing in the fan shaft of the basement air that can require repairs/replacement.
The duct from the basement air unit going up the rear cap can come apart.
Make sure that the dash heater/air conditioner outlets are working properly. They will default to defrost only.
Check the front and rear cap seals.
Check the roof seals that run the length of the MH.
Most likely you will want to replace the TV.
If it has a Winegard auto roof antenna, it may not work with HD TV.
I would check the HWH jacks. May be slow retracting. Especially when it cold outside. There are replacement springs that help.
Check the slideout covers. Unit that old, they may need replacing.
Make sure the maintenance on the Trany is up to date.