ampeg b25 chassis -- working but needs your help

Description

As part of a downsizing, I’m including a few projects I don’t have time to complete.
This is an Ampeg B25 chassis, probably from 1968 or 1969 (since it's still labelled "B25").   There’s no head cabinet, just the working chassis.     It does power up.    But, it doesn’t work well at the moment.   If i dime the volume pots I can hear the signal thru the speaker, so I expect the issue is with the preamp area, but replacing the tubes didn't do it.    Due to work I won't have time to fool with it again soon.
This website (
https://guitardatabase.fandom.com/wiki/Ampeg_B-25_1968-1972
describes the B25 better than I could:
“The Ampeg B-25 is a 55W all-tube bass amp head released by Ampeg in 1968 and produced until the late 1970s. By 1968, Ampeg was firmly planted as a world class amp builder, having had massive success with their Portaflex "flip top" amplifier series, headlined by the B-15N which was the preferred amp of nearly every Motown act of the 60s. The B-25 was something of a "spiritual successor" to the B-15N, at least in terms of the circuit topology. While the B-15N featured a 6SL7-based preamp mated to a 2x6L6 30W power amp, the B-25 used the nowadays more familiar 12AX7 tube in its preamp but rare 7027A power tubes for a rated output of 55W, the same power amp design used in the V2 and VT-40 guitar amps of the era. While the preamp tubes are different between the B-25 and B-15N, the preamp design is almost the exact same, including identical tone stacks and a very small modification to the "Ultra Lo" switch. For all intents and purposes, the B-25 is the B-15N's big brother. The vastly increased headroom makes the B-25 a bit less gritty than the B-15N, but both feature a very similar warm, punchy sound that is unmistakably Ampeg.”
As the pics show, the faceplate has a lot of wear.   Switches and knobs are attached and operate, although the polarity plastic toggle broke and it needs to be switched with a sharp tool.    Almost all the bits and pieces of electronica are easy to access, and can be purchased online.    As you can see, alot of the caps are new (and attached correctly, thanks).    Tubes aren’t included because I need them for another amp.   THIS IS A PROJECT.      IT DOESN’T WORK RIGHT AND YOU WILL NEED TO REPAIR IT.
Both transformers are huge, so this thing is heavy, almost 30 pounds as is.     It will be double boxed so it survives shipping.    Local pickup would be great!