Panasonic fridge freezer model NR-B53V1

On practically everything else out there similar to your machine. Usually with water depositing in or underneath the crispers a waste, as in defosted water, drainway hole gets blocked up with food BUT since your Panasonic is bound to be frost free that could mean something much worse technically such as an ice blockage over said drainway because some defrost heater has failed causing defrosting water to seep under the crispers . Looking soley at your parts list on Partmaster you bought yourself the most complex ways of keeping a pint of milk cold, so well done you!
To be frank unless anyone else can come up with a diffinitive answer your into calling out a panasonic experienced refigeration engineer. Could be something as simple as just mentioned ( even by Panasonic standards of total lunacy ) but I would not bank on it/ Looks as though there are still parts available, roughly around 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} and at least that is the important stuff – blimey parts are not cheap but then the machine wasn`t. I would hold out a bit longer for someone on this site who may be able to technically help; I have never worked on a Panasonic f/fzr I`m a washing machine engineer who typically might only see 4 panasonics a YEAR if that, they are not very common so presume your f/fzr is not going to be too.