Totally agree with Dan on R59, the 3.3 ohm shunt resistor.
That resistor...and R49, the 2w 1.5K ohm resistor on the 250V line just above it, are often found heat damaged in the T-4XC, and I usually change them whenever a T-4XC comes my way....just because.? Your R49 looks slightly bulged around the middle to me in?your pic.? ?Check it at the very least.