Accuphase T-100 noise

I bought one used earlier on this year. It had been calibrated and cleaned by a well known fm tuner specialist. It was fine for a few months but is now quite noisy for about 90 minutes after I turn it on. After that it's wonderfully quiet.

I could leave it on all the time but was warned that some of the lights may burn out and they're hard to replace.

Before sending it in for service, I thought I'd ask if anyone else has any experience.