Oh the joys of a restoration So I finally had some time to put into the 2230 of mine. I could not get the stereo lights ( 2) to work. I had pulled the bulbs which were toast and replaced them with some LEDs I gotten off eBay as a package deal. The LEDs were warm white and worked fine on the indicator lights. They, did not work on the Stereo indicator. I thought there was an issue but I had 12 volts to the LEDs, then dropped to 10 by a resistor until the threshold was hit where the voltage went to 15. I had a pair of LEDs from irebuildmarantz which I tested with a battery and they worked fine. Then I got to thinking, I've seen where the warm LEDs are noted to be polarized.. the RED ones from IRM were not. That made me think that the ones I put in were and it matters for this application. So pulled the front apart.. again Then pulled the warm LEDs and replaced them with the non-polarized RED LEDs.. bingo!! everything works and yes, the ones I pulled are fine.. but they are polarized LEDs. I got all of this done and thought I was done with the bottom of the unit until I snipped a OEM tie by the rotary switch and FM dropped out.. completely.. as did AM. I found out that it's a loose/bad solder/pinched wire.. somewhere right by the switch. This is going to take some work to track down. I can jiggle and sometimes it dies then comes back.. sometimes weak.. sometimes strong. But damned if I can get the exact wire to repeat it :/ Note.. why replace caps on the tone board? because of the OEM 3.3 uF cap ( all of them were this high or higher) coming in at 22 ohms and over 40% off vs the .20 ohms and less than 2% off of a Wilma cap. Virtually every electrolytic has drifted one way or the other. This unit has been unusual with several corroded/dead caps. I don't often see that so far with this being my 5th Marantz so far. It will be an interesting trend to see if certain models lend themselves to failing caps. I should add after recapping the tone board, this unit really came to lift sound wise. It worked before, it was just sorta flat and not much range on the various tone adjustments. Not the case now.