My oscilloscope has a diagnostic error T1XX1+ or T1XX2. What does this indicate?

My oscilloscope has a diagnostic error T1XX1+ or T1XX2. What does this indicate?

These diagnostic error codes indicate a problem with the ROM’s. The error code indicates which IC to check/

T1111, T1112, T1211, 1212: U300

T1121, T1122, T1221, T1222: U310

T1131, T1132, T1231, T1232: U400

T1141, T1142, T1241, T1242: U410

Due to the age of these products, replacement parts are no longer available. Repairs on these products are available from Tektronix Service on a best effort basis.