An update: Thierry tried everything and we concluded it was a hardware issue after hours of work in diagnosis. Thank you Thierry for the efforts, merit given. The test output is below for the record if anyone else runs into this. The board will be sold for parts or will be at the bottom of the local river.
--- version:
last commit version: ac6658d commit time: 2019-06-19 17:54:11 build: 2019-06-19 18:10:08
--- cgpu_init
mmap axi_fpga_addr = 0xb6fc5000
axi_fpga_addr data = 0xb013
mmap fpga_mem_addr = 0xb5e55000
power firmware version is 00 06
power type APW9 3600W
---read_config: gHashBoard_BHB07601
CcDelay1_test_times = 0x04
CoreClockDelay1 = 0xb4
CcDelay2_test_times = 0x00
CoreClockDelay2 = 0xf4
gPattern_number = 8
Invalid_Asic_Num = 48
Invalid_Core_Num = 128
Least_nonce_per_core = 14
Most_HW_Num = 128
timeout_percent = 10
baudrate = 3
io_strength = 0x02172111
Only_find_ASIC = 0
pre_open_core_voltage = 2000
Voltage1 = 1800
StartTemp = 0
TargetTemp = 100
AlarmTemp = 105
fan_speed = 10
HashBoard_Hardware_Version_1 = 1
HashBoard_Hardware_Version_2 = 1
HashBoard_Bom_Version_1 = 1
HashBoard_Bom_Version_2 = 3
HashBoard_Product_ID = 0
repair_mode = 0
Dump_Lost_Nonce = 0
bad_chip_nonce_rate_upper_limit = 90
bad_chip_nonce_rate_lower_limit = 75
per_domain_received_nonce_limit = 110
per_asic_domain_received_nonce_limSun Aug 15 15:55:53 UTC 2021
it = 75
bad_chip_num = 1
check_sensor_times = 5
--- get_works_v2
get_works took 4.555s
Ready begin test
Begin singleBoardTest_BHB07601_BM1397 test
--- init_fpga
FPGA version 0xb013
--- reset_global_arg
--- check_chain
--- check_chain: gChain = 0, gI2c = 0
--- BHB07601_show_status_func: which_chain = 0, which_i2c = 0
--- singleBoardTest_BHB07601_BM1397: Test_EEPROM: Check EEPROM ok!!!
--- reset_dsPIC33EP16GS202_pic failed! read_back_data[0] = 0xff, read_back_data[1] = 0xff
--- jump_from_loader_to_app_dsPIC33EP16GS202 failed! read_back_data[0] = 0xff, read_back_data[1] = 0xff
--- heart_beat_dsPIC33EP16GS202 failed!
--- APW9_calculate_voltage: voltage_n = 48.745106, N = 48
--- set_pre_open_core_voltage: Conf.pre_open_core_voltage = 2000, N = 48
set_pre_open_core_voltage line 529: Enter hash board power on flow:
set_pre_open_core_voltage line 533: Reset hash board done
--- enable_dsPIC33EP16GS202_dc_dc
--- enable_dsPIC33EP16GS202_dc_dc failed! read_back_data[0] = 0x00, read_back_data[1] = 0x