Techs won’t touch them because of two main reasons:
(1) Replacement Parts are unavailable and the only possible source is Frankesteining from another old sold-for-parts unit , if even possible.. In your very old model case, it’s a Hail Mary case, at best. Techs intuitively won’t invest valuable time to source this.
(2) The costs to potentially fix it invokes a further not insignificant labour cost . In the end, their final parts and labour and taxes invoice to you will grossly exceed its FMV. Techs prior experience in resulting bad debts risk predicates a hard “pass” from the get-go
Not sure what you mean by "Techs", because I have slightly different opinion -- an opinion of a tech. I own Sunfire SRA amplifier that was built around that era and started HUMMING pretty LOUD... Guess What? Few caps and transistor had been identified in the driving stage while the output stage and large filter caps were perfectly fine. Now the transistor isn't the one that was original -- found NTE replacement and BOOM -- back in business no sound quality compromise.
Many techs can ID problems without having any circuit diagram by tracing hum with either oscilloscope or headphones.
All parts are being re-marked and often manufactured with different names and markings as equivalents to the prior parts. After techs had identified the problem(if any) they will try to find OG part and if not, they will find an equivalent part.
To the best of my knowledge, your unit built in 2002 is repairable and serviceable.
@roxy54 ...Had been lately disappointed with pretty much ANYTHING new today so newer-better thing may hurt financially and functionally.